Drop down menu is generated by the languages supported by search engines,

searxng/searxng_extra/update/update_engine_traits.py

Lines 101 to 105 in cd64fb9

	def filter_locales(traits_map: EngineTraitsMap):
	"""Filter language & region tags by a threshold."""
	min_eng_per_region = 18
	min_eng_per_lang = 22

from a very old version,

pew, serbian has removed in 14f73ef a year ago.

You can use search syntax .. :sr foo

Thank you so much.
I will test it on my instance and create a PR to get it back.

I will test it on my instance and create a PR to get it back.

Sorry if I was not clear: to get it back we have to reduce min_eng_per_lang .. but then we have to many languages in the menu .. The reason SR is no longer on the list is that too few search engines support this language.

the locales is gone from settings.yml.

I guess you are looking for option search.languages