[fix] add back missing languages & regions (followup of PR #1071)

In PR #1071 the language catalog of dailymotion has been cleaned up, before
there had been over 7000 "languages" in the catalog.

As a side effect of this clean-up the language & region catalog in SearXNG has
been reduced [1].

This patch reduce the ``min_engines_per_lang`` from 13 to 12 to get the missed
languages back in language & region catalog of SearXNG.

[1] https://github.com/searxng/searxng/pull/1071/commits/3bb62823ec3af0e67bd2d959bec20c4791ee3bac#diff-f3f00db0f87f95b882624a192e0aac21525638af0b18c9514e765fcf1991678d



Requested-by: @tiekoetter in a Matrix chat
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>