diff --git a/docs/user/configured_engines.rst b/docs/user/configured_engines.rst
index 44cb496b8..a81828e4c 100644
--- a/docs/user/configured_engines.rst
+++ b/docs/user/configured_engines.rst
@@ -58,8 +58,8 @@ Configured Engines
       {% for mod in engines %}
 
       * - `{{mod.name}} <{{mod.about and mod.about.website}}>`_
-          {%- if mod.about and  mod.about.language %}
-          ({{mod.about.language | upper}})
+          {%- if mod.language %}
+          ({{mod.language | upper}})
           {%- endif %}
         - ``!{{mod.shortcut}}``
         - {%- if 'searx.engines.' + mod.__name__ in documented_modules %}
diff --git a/searx/enginelib/__init__.py b/searx/enginelib/__init__.py
index 5e8d738a9..0af69190d 100644
--- a/searx/enginelib/__init__.py
+++ b/searx/enginelib/__init__.py
@@ -41,7 +41,7 @@ if t.TYPE_CHECKING:
     from searx.enginelib.traits import EngineTraits
     from searx.extended_types import SXNG_Response
     from searx.result_types import EngineResults
-    from searx.search.processors import OfflineParamTypes, OnlineParamTypes
+    from searx.search.processors import OfflineParamTypes, OnlineParamTypes, ProcessorType
 
 ENGINES_CACHE: ExpireCacheSQLite = ExpireCacheSQLite.build_cache(
     ExpireCacheCfg(
@@ -180,7 +180,7 @@ class EngineCache:
         return ENGINES_CACHE.secret_hash(name=name)
 
 
-class EngineAbout(msgspec.Struct):
+class EngineAbout(msgspec.Struct, kw_only=True):
     """Additional fields describing the engine.
 
     .. code:: yaml
@@ -213,12 +213,11 @@ class EngineAbout(msgspec.Struct):
     results: str = ""
     """Data format of the source (online-engines: of the response)."""
 
-    language: str = ""
-    """If the engine supports only one language, this language is specified
-    here (``en``, ``de``, ``"no"`` or ..); otherwise, the value remains empty.
+    description: str = ""
+    """Brief description of the engine and where it gets its data from.
 
-    For the YAML configuration: think of the `YAML-Norway problem
-    <https://ruuda.nl/2023/the-yaml-document-from-hell#the-norway-problem>`_
+    This value should only be set as long as no description of the data source
+    is available via a :py:obj:`EngineAbout.wikidata_id`.
     """
 
 
@@ -227,6 +226,8 @@ class Engine(abc.ABC):  # pylint: disable=too-few-public-methods
 
     Further documentation see :ref:`general engine configuration`.
 
+    The defaults are taken from :py:obj:`searx.engines.ENGINE_DEFAULT_ARGS`.
+
     .. hint::
 
        This class is currently never initialized and only used for type hinting.
@@ -234,49 +235,27 @@ class Engine(abc.ABC):  # pylint: disable=too-few-public-methods
 
     logger: logging.Logger
 
-    # Common options in the engine module
+    # Common options of the engine module
 
-    engine_type: str
+    engine_type: "ProcessorType" = "online"
     """Type of the engine (:ref:`searx.search.processors`)"""
 
-    paging: bool
+    paging: bool = False
     """Engine supports multiple pages."""
 
     max_page: int = 0
     """If the engine supports paging, then this is the value for the last page
     that is still supported. ``0`` means unlimited numbers of pages."""
 
-    time_range_support: bool
+    time_range_support: bool = False
     """Engine supports search time range."""
 
-    safesearch: bool
+    safesearch: bool = False
     """Engine supports SafeSearch"""
 
-    language_support: bool
+    language_support: bool = False
     """Engine supports languages (locales) search."""
 
-    language: str
-    """For an engine, when there is ``language: ...`` in the YAML settings the engine
-    does support only this one language:
-
-    .. code:: yaml
-
-      - name: google french
-        engine: google
-        language: fr
-    """
-
-    region: str
-    """For an engine, when there is ``region: ...`` in the YAML settings the engine
-    does support only this one region::
-
-    .. code:: yaml
-
-      - name: google belgium
-        engine: google
-        region: fr-BE
-    """
-
     fetch_traits: "Callable[[EngineTraits, bool], None]"
     """Function to to fetch engine's traits from origin."""
 
@@ -285,9 +264,6 @@ class Engine(abc.ABC):  # pylint: disable=too-few-public-methods
 
     # settings.yml
 
-    categories: list[str]
-    """Specifies to which :ref:`engine categories` the engine should be added."""
-
     name: str
     """Name that will be used across SearXNG to define this engine.  In settings, on
     the result page .."""
@@ -297,6 +273,43 @@ class Engine(abc.ABC):  # pylint: disable=too-few-public-methods
     this search engine (file name from :origin:`searx/engines` without
     ``.py``)."""
 
+    categories: list[str] = ["general"]
+    """Specifies to which :ref:`engine categories` the engine should be added."""
+
+    language: str = ""
+    """If the engine supports only one language, this language is specified here
+    (``en``, ``de``, ``"no"`` or ..); otherwise, the value remains empty. For
+    the YAML configuration: think of the `YAML-Norway problem
+    <https://ruuda.nl/2023/the-yaml-document-from-hell#the-norway-problem>`_
+
+    .. code:: yaml
+
+      - name: google norway
+        engine: google
+        language: "no"
+
+    Depending on ``language_support``, this value has similar but also slightly
+    different meanings.
+
+    - When ``language_support`` is **true**, the map of
+      :py:obj:`traits.EngineTraits.languages` is reduced to the selected
+      language
+
+    - When ``language_support`` is **false**, then the implementation of the
+      engine only supports this one ``language``
+    """
+
+    region: str = ""
+    """For an engine, when there is ``region: ...`` in the YAML settings the engine
+    does support only this one region::
+
+    .. code:: yaml
+
+      - name: google belgium
+        engine: google
+        region: fr-BE
+    """
+
     enable_http: bool
     """Enable HTTP (by default only HTTPS is enabled)."""
 
@@ -309,6 +322,31 @@ class Engine(abc.ABC):  # pylint: disable=too-few-public-methods
     display_error_messages: bool
     """Display error messages on the web UI."""
 
+    disabled: bool = False
+    """To disable by default the engine, but not deleting it.  It will allow the
+    user to manually activate it in the settings."""
+
+    inactive: bool = False
+    """Remove the engine from the settings (*disabled & removed*)."""
+
+    about: EngineAbout = EngineAbout()
+    """Additional fields describing the engine."""
+
+    using_tor_proxy: bool = False
+    """Using tor proxy (``true``) or not (``false``) for this engine."""
+
+    send_accept_language_header: bool = True
+    """When this option is activated (default), the language (locale) that is
+    selected by the user is used to build and send a ``Accept-Language`` header
+    in the request to the origin search engine."""
+
+    tokens: list[str] = []
+    """A list of secret tokens to make this engine *private*, more details see
+    :ref:`private engines`."""
+
+    weight: float = 1.0
+    """Weighting of the results of this engine (:ref:`weight <settings engines>`)."""
+
     proxies: dict[str, dict[str, str]]
     """Set proxies for a specific engine (YAML):
 
@@ -319,31 +357,6 @@ class Engine(abc.ABC):  # pylint: disable=too-few-public-methods
          https: socks5://proxy:port
     """
 
-    disabled: bool
-    """To disable by default the engine, but not deleting it.  It will allow the
-    user to manually activate it in the settings."""
-
-    inactive: bool
-    """Remove the engine from the settings (*disabled & removed*)."""
-
-    about: EngineAbout
-    """Additional fields describing the engine."""
-
-    using_tor_proxy: bool
-    """Using tor proxy (``true``) or not (``false``) for this engine."""
-
-    send_accept_language_header: bool
-    """When this option is activated (default), the language (locale) that is
-    selected by the user is used to build and send a ``Accept-Language`` header
-    in the request to the origin search engine."""
-
-    tokens: list[str]
-    """A list of secret tokens to make this engine *private*, more details see
-    :ref:`private engines`."""
-
-    weight: int
-    """Weighting of the results of this engine (:ref:`weight <settings engines>`)."""
-
     def setup(self, engine_settings: dict[str, t.Any]) -> bool:  # pylint: disable=unused-argument
         """Dynamic setup of the engine settings.
 
diff --git a/searx/enginelib/traits.py b/searx/enginelib/traits.py
index 4a051ac05..d4d45ac19 100644
--- a/searx/enginelib/traits.py
+++ b/searx/enginelib/traits.py
@@ -142,11 +142,11 @@ class EngineTraits:
         """
 
         if self.data_type == "traits_v1":
-            self._set_traits_v1(engine)
+            self._set_traits_v1(engine)  # pyright: ignore[reportArgumentType]
         else:
             raise TypeError("engine traits of type %s is unknown" % self.data_type)
 
-    def _set_traits_v1(self, engine: "Engine | types.ModuleType") -> None:
+    def _set_traits_v1(self, engine: "Engine") -> None:
         # For an engine, when there is `language: ...` in the YAML settings the engine
         # does support only this one language (region)::
         #
@@ -159,22 +159,25 @@ class EngineTraits:
 
         _msg = "settings.yml - engine: '%s' / %s: '%s' not supported"
 
-        languages = traits.languages
-        if hasattr(engine, "language"):
-            if engine.language not in languages:
-                raise ValueError(_msg % (engine.name, "language", engine.language))
-            traits.languages = {engine.language: languages[engine.language]}
+        if engine.language:
+            if engine.language_support:
+                if not len(traits.languages) > 1:
+                    raise ValueError(
+                        f"engine {engine.name}: activated language_support with just one or less languages"
+                    )
+                if engine.language not in traits.languages:
+                    raise ValueError(_msg % (engine.name, "language", engine.language))
+                traits.languages = {engine.language: traits.languages[engine.language]}
 
-        regions = traits.regions
-        if hasattr(engine, "region"):
-            if engine.region not in regions:
+        if engine.region:
+            if engine.region not in traits.regions:
                 raise ValueError(_msg % (engine.name, "region", engine.region))
-            traits.regions = {engine.region: regions[engine.region]}
+            traits.regions = {engine.region: traits.regions[engine.region]}
 
         engine.language_support = bool(traits.languages or traits.regions)
 
         # set the copied & modified traits in engine's namespace
-        engine.traits = traits  # pyright: ignore[reportAttributeAccessIssue]
+        engine.traits = traits
 
 
 class EngineTraitsMap(dict[str, EngineTraits]):
diff --git a/searx/engines/360search.py b/searx/engines/360search.py
index 900d59082..bf1ba9821 100644
--- a/searx/engines/360search.py
+++ b/searx/engines/360search.py
@@ -22,8 +22,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "zh",
 }
+language = "zh"
 
 # Engine Configuration
 categories = ["general"]
diff --git a/searx/engines/__builtins__.pyi b/searx/engines/__builtins__.pyi
index e16ae48ce..ff3cfda0b 100644
--- a/searx/engines/__builtins__.pyi
+++ b/searx/engines/__builtins__.pyi
@@ -5,19 +5,19 @@ intended monkey patching of the engine modules.
 .. attention::
 
    Monkey-patching modules is a practice from the past that shouldn't be
-   expanded upon.  In the long run, there should be an engine class that can be
-   inherited.  However, as long as this class doesn't exist, and as long as all
-   engine modules aren't converted to an engine class, these builtin types will
-   still be needed.
+   expanded upon.  In the long run, engines should be instances of
+   :py:obj:`searx.enginelib.Engine`. However, as long as long as all engine
+   modules aren't converted to this class, these builtin types will still be
+   needed.
 """
 
 import logging
 from searx.enginelib import traits as _traits
 
 logger: logging.Logger
-supported_languages: str
-language_aliases: str
 language_support: bool
+language: str
+region: str
 traits: _traits.EngineTraits
 
 # from searx.engines.ENGINE_DEFAULT_ARGS
diff --git a/searx/engines/__init__.py b/searx/engines/__init__.py
index e906b780b..b225575e7 100644
--- a/searx/engines/__init__.py
+++ b/searx/engines/__init__.py
@@ -17,37 +17,44 @@ from os.path import realpath, dirname
 
 import types
 import inspect
+import msgspec
 
 from searx import logger, settings
 from searx.utils import load_module
 
-if t.TYPE_CHECKING:
-    from searx.enginelib import Engine
+from searx.enginelib import Engine, EngineAbout
 
 logger = logger.getChild('engines')
 ENGINE_DIR = dirname(realpath(__file__))
 
 # Defaults for the namespace of an engine module, see load_engine()
-ENGINE_DEFAULT_ARGS: dict[str, int | str | list[t.Any] | dict[str, t.Any] | bool] = {
+ENGINE_DEFAULT_ARGS: dict[str, t.Any] = {
     # Common options in the engine module
     "engine_type": "online",
     "paging": False,
+    "max_page": 0,
     "time_range_support": False,
     "safesearch": False,
+    "language_support": False,
     # settings.yml
     "categories": ["general"],
+    "language": "",
+    "region": "",
     "enable_http": False,
     "shortcut": "-",
     "timeout": settings["outgoing"]["request_timeout"],
     "display_error_messages": True,
     "disabled": False,
     "inactive": False,
-    "about": {},
+    "about": EngineAbout(),
     "using_tor_proxy": False,
     "send_accept_language_header": True,
     "tokens": [],
-    "max_page": 0,
+    "weight": 1.0,
 }
+"""Default values that are set in an engine of type *module*, please compare
+with the class :py:obj:`searx.enginelib.Engine`."""
+
 # set automatically when an engine does not have any tab category
 DEFAULT_CATEGORY = 'other'
 
@@ -178,13 +185,27 @@ def set_loggers(engine: "Engine|types.ModuleType", engine_name: str):
 
 def update_engine_attributes(engine: "Engine | types.ModuleType", engine_data: dict[str, t.Any]):
     # set engine attributes from engine_data
+
+    kvargs: dict[str, t.Any]
+    if isinstance(engine.about, EngineAbout):
+        kvargs = {**msgspec.to_builtins(engine.about), **engine_data.get("about", {})}
+    else:
+        kvargs = {**engine.about, **engine_data.get("about", {})}
+
+    try:
+        engine.about = EngineAbout(**kvargs)
+    except TypeError as exc:
+        raise TypeError(
+            f"engine {engine_data['name']} ({engine_data['engine']}) - in the about section --> {exc}"
+        ) from exc
+
     for param_name, param_value in engine_data.items():
+        if param_name == "about":
+            continue
         if param_name == 'categories':
             if isinstance(param_value, str):
                 param_value = list(map(str.strip, param_value.split(',')))
             engine.categories = param_value  # type: ignore
-        elif hasattr(engine, 'about') and param_name == 'about':
-            engine.about = {**engine.about, **engine_data['about']}  # type: ignore
         else:
             setattr(engine, param_name, param_value)
 
diff --git a/searx/engines/acfun.py b/searx/engines/acfun.py
index c0a9510b3..90922680f 100644
--- a/searx/engines/acfun.py
+++ b/searx/engines/acfun.py
@@ -16,12 +16,12 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "zh",
 }
 
 # Engine Configuration
 categories = ["videos"]
 paging = True
+language = "zh"
 
 # Base URL
 base_url = "https://www.acfun.cn"
diff --git a/searx/engines/ansa.py b/searx/engines/ansa.py
index 56cbee31a..21afed900 100644
--- a/searx/engines/ansa.py
+++ b/searx/engines/ansa.py
@@ -42,8 +42,8 @@ about = {
     'use_official_api': False,
     'require_api_key': False,
     'results': 'HTML',
-    'language': 'it',
 }
+language = "it"
 
 
 def request(query, params):
diff --git a/searx/engines/azure.py b/searx/engines/azure.py
index 4c916bc3b..e00d75872 100644
--- a/searx/engines/azure.py
+++ b/searx/engines/azure.py
@@ -54,8 +54,8 @@ about = {
     "use_official_api": True,
     "require_api_key": True,
     "results": "JSON",
-    "language": "en",
 }
+language = "en"
 
 CACHE: EngineCache
 """Persistent (SQLite) key/value cache that deletes its values after ``expire``
diff --git a/searx/engines/baidu.py b/searx/engines/baidu.py
index 57d1ed444..4d93100ca 100644
--- a/searx/engines/baidu.py
+++ b/searx/engines/baidu.py
@@ -23,8 +23,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "JSON",
-    "language": "zh",
 }
+language = "zh"
 
 paging = True
 categories = []
diff --git a/searx/engines/bpb.py b/searx/engines/bpb.py
index b28fa5895..904f7a44c 100644
--- a/searx/engines/bpb.py
+++ b/searx/engines/bpb.py
@@ -13,8 +13,8 @@ about = {
     'use_official_api': False,
     'require_api_key': False,
     'results': 'JSON',
-    'language': 'de',
 }
+language = "de"
 
 paging = True
 categories = ['general']
diff --git a/searx/engines/chefkoch.py b/searx/engines/chefkoch.py
index c569f90f3..99dd5b918 100644
--- a/searx/engines/chefkoch.py
+++ b/searx/engines/chefkoch.py
@@ -10,8 +10,8 @@ about = {
     'use_official_api': False,
     'require_api_key': False,
     'results': 'JSON',
-    'language': 'de',
 }
+language = "de"
 
 paging = True
 categories = []
diff --git a/searx/engines/chinaso.py b/searx/engines/chinaso.py
index 620ecc730..a94f4059e 100644
--- a/searx/engines/chinaso.py
+++ b/searx/engines/chinaso.py
@@ -70,13 +70,13 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "JSON",
-    "language": "zh",
 }
 
 paging = True
 time_range_support = True
 results_per_page = 10
 categories = []
+language = "zh"
 
 ChinasoCategoryType = t.Literal['news', 'videos', 'images']
 """ChinaSo supports news, videos, images search.
diff --git a/searx/engines/demo_offline.py b/searx/engines/demo_offline.py
index 26cd62554..e3fc34f48 100644
--- a/searx/engines/demo_offline.py
+++ b/searx/engines/demo_offline.py
@@ -24,7 +24,7 @@ import typing as t
 import json
 
 from searx.result_types import EngineResults
-from searx.enginelib import EngineCache
+from searx.enginelib import EngineCache, EngineAbout
 
 if t.TYPE_CHECKING:
     from searx.search.processors import RequestParams
@@ -35,13 +35,11 @@ categories = ["general"]
 disabled = True
 timeout = 2.0
 
-about = {
-    "wikidata_id": None,
-    "official_api_documentation": None,
-    "use_official_api": False,
-    "require_api_key": False,
-    "results": "JSON",
-}
+language = "en"
+about = EngineAbout(
+    results="JSON",
+    description="Demo offline engine Engine with results in the English language.",
+)
 
 # if there is a need for globals, use a leading underline
 _my_offline_engine: str = ""
diff --git a/searx/engines/demo_online.py b/searx/engines/demo_online.py
index 3dcf3935b..0c74e050b 100644
--- a/searx/engines/demo_online.py
+++ b/searx/engines/demo_online.py
@@ -25,6 +25,7 @@ import typing as t
 
 from urllib.parse import urlencode
 from searx.result_types import EngineResults
+from searx.enginelib import EngineAbout
 
 if t.TYPE_CHECKING:
     from searx.extended_types import SXNG_Response
@@ -43,14 +44,14 @@ page_size = 20
 search_api = "https://api.artic.edu/api/v1/artworks/search"
 image_api = "https://www.artic.edu/iiif/2/"
 
-about = {
-    "website": "https://www.artic.edu",
-    "wikidata_id": "Q239303",
-    "official_api_documentation": "http://api.artic.edu/docs/",
-    "use_official_api": True,
-    "require_api_key": False,
-    "results": "JSON",
-}
+about = EngineAbout(
+    website="https://www.artic.edu",
+    wikidata_id="Q239303",
+    official_api_documentation="http://api.artic.edu/docs/",
+    use_official_api=True,
+    require_api_key=False,
+    results="JSON",
+)
 
 
 # if there is a need for globals, use a leading underline
diff --git a/searx/engines/destatis.py b/searx/engines/destatis.py
index e9ac5deae..3622cd173 100644
--- a/searx/engines/destatis.py
+++ b/searx/engines/destatis.py
@@ -11,8 +11,8 @@ about = {
     'use_official_api': False,
     'require_api_key': False,
     'results': 'HTML',
-    'language': 'de',
 }
+language = "de"
 
 categories = []
 paging = True
diff --git a/searx/engines/duden.py b/searx/engines/duden.py
index b422d8339..77664f887 100644
--- a/searx/engines/duden.py
+++ b/searx/engines/duden.py
@@ -14,8 +14,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": 'HTML',
-    "language": 'de',
 }
+language = "de"
 
 categories = ['dictionaries']
 paging = True
diff --git a/searx/engines/elasticsearch.py b/searx/engines/elasticsearch.py
index c613ae367..382a52dd9 100644
--- a/searx/engines/elasticsearch.py
+++ b/searx/engines/elasticsearch.py
@@ -55,7 +55,7 @@ about = {
     'official_api_documentation': 'https://www.elastic.co/guide/en/elasticsearch/reference/current/search-search.html',
     'use_official_api': True,
     'require_api_key': False,
-    'format': 'JSON',
+    "results": "JSON",
 }
 
 base_url = 'http://localhost:9200'
diff --git a/searx/engines/geizhals.py b/searx/engines/geizhals.py
index 4ada41919..6b8511fb9 100644
--- a/searx/engines/geizhals.py
+++ b/searx/engines/geizhals.py
@@ -27,8 +27,8 @@ about = {
     'official_api_documentation': None,
     'require_api_key': False,
     'results': 'HTML',
-    'language': 'de',
 }
+language = "de"
 paging = True
 categories = ['shopping']
 
diff --git a/searx/engines/il_post.py b/searx/engines/il_post.py
index 1215c4dad..862836607 100644
--- a/searx/engines/il_post.py
+++ b/searx/engines/il_post.py
@@ -34,8 +34,8 @@ about = {
     "use_official_api": True,
     "require_api_key": False,
     "results": "JSON",
-    "language": "it",
 }
+language = "it"
 
 
 def request(query, params):
diff --git a/searx/engines/ina.py b/searx/engines/ina.py
index 45f871941..bebd3808e 100644
--- a/searx/engines/ina.py
+++ b/searx/engines/ina.py
@@ -16,8 +16,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": 'HTML',
-    "language": 'fr',
 }
+language = "fr"
 
 # engine dependent config
 categories = ['videos']
diff --git a/searx/engines/iqiyi.py b/searx/engines/iqiyi.py
index eab954242..b0bb38535 100644
--- a/searx/engines/iqiyi.py
+++ b/searx/engines/iqiyi.py
@@ -14,9 +14,9 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "JSON",
-    "language": "zh",
 }
 
+language = "zh"
 paging = True
 time_range_support = True
 categories = ["videos"]
diff --git a/searx/engines/jisho.py b/searx/engines/jisho.py
index 7f4392bc1..b167d864a 100644
--- a/searx/engines/jisho.py
+++ b/searx/engines/jisho.py
@@ -13,8 +13,8 @@ about = {
     "use_official_api": True,
     "require_api_key": False,
     "results": 'JSON',
-    "language": 'ja',
 }
+language = "ja"
 
 categories = ['dictionaries']
 paging = False
@@ -110,8 +110,8 @@ def get_infobox(alt_forms, result_url, definitions):
     # definitions
     infobox_content.append(
         '''
-        <small><a href="https://www.edrdg.org/wiki/index.php/JMdict-EDICT_Dictionary_Project">JMdict</a> 
-        and <a href="https://www.edrdg.org/enamdict/enamdict_doc.html">JMnedict</a> 
+        <small><a href="https://www.edrdg.org/wiki/index.php/JMdict-EDICT_Dictionary_Project">JMdict</a>
+        and <a href="https://www.edrdg.org/enamdict/enamdict_doc.html">JMnedict</a>
         by <a href="https://www.edrdg.org/edrdg/licence.html">EDRDG</a>, CC BY-SA 3.0.</small>
         <ul>
     '''
diff --git a/searx/engines/json_engine.py b/searx/engines/json_engine.py
index 1a2dcda60..dd9575e47 100644
--- a/searx/engines/json_engine.py
+++ b/searx/engines/json_engine.py
@@ -79,6 +79,9 @@ from json import loads
 from urllib.parse import urlencode
 from searx.utils import to_string, html_to_text
 from searx.network import raise_for_httperror
+from searx.enginelib import EngineAbout
+
+about = EngineAbout()
 
 search_url = None
 """
diff --git a/searx/engines/mediathekviewweb.py b/searx/engines/mediathekviewweb.py
index 8baa20bdb..70afc4057 100644
--- a/searx/engines/mediathekviewweb.py
+++ b/searx/engines/mediathekviewweb.py
@@ -11,9 +11,9 @@ about = {
     "use_official_api": True,
     "require_api_key": False,
     "results": 'JSON',
-    "language": "de",
 }
 
+language = "de"
 categories = ['videos']
 paging = True
 time_range_support = False
diff --git a/searx/engines/moviepilot.py b/searx/engines/moviepilot.py
index 532c1e66e..6011405ed 100644
--- a/searx/engines/moviepilot.py
+++ b/searx/engines/moviepilot.py
@@ -35,8 +35,9 @@ about = {
     'use_official_api': False,
     'require_api_key': False,
     'results': 'JSON',
-    'language': 'de',
 }
+language = "de"
+
 paging = True
 categories = ["movies"]
 
diff --git a/searx/engines/naver.py b/searx/engines/naver.py
index c715bc319..ca8d79f7e 100644
--- a/searx/engines/naver.py
+++ b/searx/engines/naver.py
@@ -26,8 +26,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "ko",
 }
+language = "ko"
 
 categories = []
 paging = True
diff --git a/searx/engines/niconico.py b/searx/engines/niconico.py
index b421a9806..8a943174b 100644
--- a/searx/engines/niconico.py
+++ b/searx/engines/niconico.py
@@ -13,8 +13,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "ja",
 }
+language = "ja"
 
 categories = ["videos"]
 paging = True
diff --git a/searx/engines/photon.py b/searx/engines/photon.py
index 950e82d68..32dea321b 100644
--- a/searx/engines/photon.py
+++ b/searx/engines/photon.py
@@ -28,7 +28,7 @@ search_string = 'api/?{query}&limit={limit}'
 result_base_url = 'https://openstreetmap.org/{osm_type}/{osm_id}'
 
 # list of supported languages
-supported_languages = ['de', 'en', 'fr', 'it']
+photon_supported_languages = ["de", "en", "fr", "it"]
 
 
 # do search-request
@@ -37,7 +37,7 @@ def request(query, params):
 
     if params['language'] != 'all':
         language = params['language'].split('_')[0]
-        if language in supported_languages:
+        if language in photon_supported_languages:
             params['url'] = params['url'] + "&lang=" + language
 
     # using SearXNG User-Agent
diff --git a/searx/engines/presearch.py b/searx/engines/presearch.py
index 00a9d3ed8..b54d85b88 100644
--- a/searx/engines/presearch.py
+++ b/searx/engines/presearch.py
@@ -77,7 +77,7 @@ from searx.utils import gen_useragent, html_to_text, parse_duration_string
 
 about = {
     "website": "https://presearch.io",
-    "wikidiata_id": "Q7240905",
+    "wikidata_id": "Q7240905",
     "official_api_documentation": "https://docs.presearch.io/nodes/api",
     "use_official_api": False,
     "require_api_key": False,
diff --git a/searx/engines/quark.py b/searx/engines/quark.py
index 38d431da9..889f1dbae 100644
--- a/searx/engines/quark.py
+++ b/searx/engines/quark.py
@@ -16,8 +16,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "zh",
 }
+language = "zh"
 
 # Engine Configuration
 categories = []
diff --git a/searx/engines/senscritique.py b/searx/engines/senscritique.py
index f4dd972ea..ea88c5c9f 100644
--- a/searx/engines/senscritique.py
+++ b/searx/engines/senscritique.py
@@ -13,8 +13,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": 'JSON',
-    'language': 'fr',
 }
+language = "fr"
 
 categories = ['movies']
 paging = True
diff --git a/searx/engines/seznam.py b/searx/engines/seznam.py
index 33f363fa2..bc2474821 100644
--- a/searx/engines/seznam.py
+++ b/searx/engines/seznam.py
@@ -19,8 +19,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "cz",
 }
+language = "cz"
 
 categories = ['general', 'web']
 base_url = 'https://search.seznam.cz/'
diff --git a/searx/engines/sogou.py b/searx/engines/sogou.py
index ea011d970..0eb1affa8 100644
--- a/searx/engines/sogou.py
+++ b/searx/engines/sogou.py
@@ -16,8 +16,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "zh",
 }
+language = "zh"
 
 # Engine Configuration
 categories = ["general"]
diff --git a/searx/engines/sogou_videos.py b/searx/engines/sogou_videos.py
index 9a3565619..7da7a9edb 100644
--- a/searx/engines/sogou_videos.py
+++ b/searx/engines/sogou_videos.py
@@ -11,8 +11,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "JSON",
-    "language": "zh",
 }
+language = "zh"
 
 categories = ["videos"]
 paging = True
diff --git a/searx/engines/sogou_wechat.py b/searx/engines/sogou_wechat.py
index c9d240ec7..c7e2b877c 100644
--- a/searx/engines/sogou_wechat.py
+++ b/searx/engines/sogou_wechat.py
@@ -14,8 +14,8 @@ about = {
     "use_official_api": False,
     "require_api_key": False,
     "results": "HTML",
-    "language": "zh",
 }
+language = "zh"
 
 # Engine Configuration
 categories = ["news"]
diff --git a/searx/engines/tagesschau.py b/searx/engines/tagesschau.py
index 7669eeb19..12d999593 100644
--- a/searx/engines/tagesschau.py
+++ b/searx/engines/tagesschau.py
@@ -27,8 +27,9 @@ about = {
     'use_official_api': True,
     'require_api_key': False,
     'results': 'JSON',
-    'language': 'de',
 }
+language = "de"
+
 categories = ['general', 'news']
 paging = True
 
diff --git a/searx/engines/tonline.py b/searx/engines/tonline.py
index cfb1dbb35..328b42d69 100644
--- a/searx/engines/tonline.py
+++ b/searx/engines/tonline.py
@@ -16,20 +16,17 @@ from lxml import html
 
 from searx.utils import eval_xpath_list, eval_xpath, extract_text, get_embeded_stream_url, ElementType
 from searx.result_types import EngineResults
+from searx.enginelib import EngineAbout
 
 if t.TYPE_CHECKING:
     from searx.extended_types import SXNG_Response
     from searx.search.processors import OnlineParams
 
-about = {
-    "website": "https://www.t-online.de",
-    "wikidata_id": "Q590940",
-    "official_api_documentation": None,
-    "use_official_api": False,
-    "require_api_key": False,
-    "results": "HTML",
-    "language": "de",
-}
+about = EngineAbout(
+    website="https://www.t-online.de",
+    wikidata_id="Q590940",
+    results="HTML",
+)
 
 paging = True
 time_range_support = True
@@ -44,6 +41,8 @@ time_range_map = {"day": "d", "week": "w", "month": "m", "year": "y"}
 # use "tonline" to only search for results from t-online news articles
 tonline_channel_map = {"images": "flickr", "videos": "yt"}
 
+language = "de"
+
 
 def init(_):
     if tonline_categ not in ("web", "images", "videos", "news"):
diff --git a/searx/engines/xpath.py b/searx/engines/xpath.py
index 081417513..0f071bca0 100644
--- a/searx/engines/xpath.py
+++ b/searx/engines/xpath.py
@@ -76,6 +76,9 @@ from lxml import html
 from searx.utils import extract_text, extract_url, eval_xpath, eval_xpath_list
 from searx.network import raise_for_httperror
 from searx.result_types import EngineResults
+from searx.enginelib import EngineAbout
+
+about = EngineAbout()
 
 search_url = None
 """
diff --git a/searx/search/processors/__init__.py b/searx/search/processors/__init__.py
index 1c9e0be3c..f7900d284 100644
--- a/searx/search/processors/__init__.py
+++ b/searx/search/processors/__init__.py
@@ -11,6 +11,7 @@ __all__ = [
     "PROCESSORS",
     "ParamTypes",
     "RequestParams",
+    "ProcessorType",
 ]
 
 import typing as t
@@ -27,6 +28,14 @@ from .online_url_search import OnlineUrlSearchProcessor, OnlineUrlSearchParams
 
 logger = logger.getChild("search.processors")
 
+ProcessorType = t.Literal[
+    "offline",
+    "online",
+    "online_currency",
+    "online_dictionary",
+    "online_url_search",
+]
+
 OnlineParamTypes: t.TypeAlias = OnlineParams | OnlineDictParams | OnlineCurrenciesParams | OnlineUrlSearchParams
 OfflineParamTypes: t.TypeAlias = RequestParams
 ParamTypes: t.TypeAlias = OfflineParamTypes | OnlineParamTypes
diff --git a/searx/settings.yml b/searx/settings.yml
index 8d52c3e6e..a509d94d9 100644
--- a/searx/settings.yml
+++ b/searx/settings.yml
@@ -330,12 +330,12 @@ engines:
     url_xpath: ./a/@href
     title_xpath: ./a/h3
     content_xpath: ./div
+    language: "no"
     about:
       website: https://abcnyheter.no
       use_official_api: false
       require_api_key: false
       results: HTML
-      language: "no"
 
   - name: acfun
     engine: acfun
@@ -2808,13 +2808,13 @@ engines:
     shortcut: rel
     categories: general
     disabled: true
+    language: de
     about:
       website: https://reloado.com
       official_api_documentation:
       use_official_api: false
       require_api_key: false
       results: HTML
-      language: de
 
   - name: repology
     engine: repology
@@ -2927,13 +2927,13 @@ engines:
     content_xpath: //div[@class="synonyms-list-group"]
     title_xpath: //div[@class="upper-synonyms"]/a
     no_result_for_http_status: [404]
+    language: de
     about:
       website: https://www.woxikon.de/
       wikidata_id:  # No Wikidata ID
       use_official_api: false
       require_api_key: false
       results: HTML
-      language: de
 
   - name: tootfinder
     engine: tootfinder
@@ -2988,13 +2988,13 @@ engines:
     content_xpath: //li/div[@class="searchresult"]
     categories: general
     disabled: true
+    language: fr
     about:
       website: https://wikimini.org/
       wikidata_id: Q3568032
       use_official_api: false
       require_api_key: false
       results: HTML
-      language: fr
 
   - name: wttr.in
     engine: wttr
diff --git a/searx/templates/simple/preferences/engines.html b/searx/templates/simple/preferences/engines.html
index 977fe9669..c0d5eb32e 100644
--- a/searx/templates/simple/preferences/engines.html
+++ b/searx/templates/simple/preferences/engines.html
@@ -60,8 +60,8 @@
                 {%- endif -%}
                 <label for="{{ engine_id }}">
                   {{- ' ' -}}{{- search_engine.name -}}
-                  {%- if search_engine.about and search_engine.about.language -%}
-                    {{- ' ' -}}({{search_engine.about.language | upper}})
+                  {%- if search_engine.language -%}
+                    {{- ' ' -}}({{search_engine.language | upper}})
                   {%- endif -%}
                   </label>
                   {{- engine_about(search_engine) -}}
diff --git a/searx/webapp.py b/searx/webapp.py
index 55ef84e8d..85f57266a 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -1075,10 +1075,9 @@ def engine_descriptions():
         result[engine] = description
 
     # overwrite by about:description (from settings)
-    for engine_name, engine_mod in engines.items():
-        descr = getattr(engine_mod, 'about', {}).get('description', None)
-        if descr is not None:
-            result[engine_name] = [descr, "SearXNG config"]
+    for eng_name, eng_obj in engines.items():
+        if eng_obj.about.description:
+            result[eng_name] = [eng_obj.about.description, "SearXNG config"]
 
     return jsonify(result)
 
diff --git a/searx/webutils.py b/searx/webutils.py
index 8cf0762e3..9c3e8a0c9 100644
--- a/searx/webutils.py
+++ b/searx/webutils.py
@@ -323,7 +323,7 @@ def group_engines_in_tab(engines: "Iterable[Engine]") -> List[Tuple[str, "Iterab
         return (group[0] == NO_SUBGROUPING, group[0].lower())
 
     def engine_sort_key(engine):
-        return (engine.about.get('language', ''), engine.name)
+        return (engine.language, engine.name)
 
     tabs = list(get_setting('categories_as_tabs').keys())
     subgroups = itertools.groupby(sorted(engines, key=get_subgroup), get_subgroup)
diff --git a/utils/lib_sxng_test.sh b/utils/lib_sxng_test.sh
index 530b4f80d..a9298841b 100755
--- a/utils/lib_sxng_test.sh
+++ b/utils/lib_sxng_test.sh
@@ -36,7 +36,7 @@ test.pylint() {
         build_msg TEST "[pylint] ./searx/engines"
         # shellcheck disable=SC2086
         pylint ${PYLINT_OPTIONS} ${PYLINT_VERBOSE} \
-            --additional-builtins="traits,supported_languages,language_aliases,logger,categories" \
+            --additional-builtins="traits,logger,categories" \
             searx/engines
 
         build_msg TEST "[pylint] ./searx ./searxng_extra ./tests"