[fix] set language_support for engines with languages in traits (#6258)

In the past, the engine option ``language_support`` was not consistently
maintained; with this patch, a ValueError is now thrown if an engine has
languages in its traits but language_support is not set to True.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/odysee.py

@@ -26,6 +26,7 @@ about = {
 # Engine configuration
 paging = True
 time_range_support = True
+language_support = True
 results_per_page = 20
 categories = ["videos"]