[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] 3bb62823ec (diff-f3f00db0f87f95b882624a192e0aac21525638af0b18c9514e765fcf1991678d)

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

searx/data/engines_languages.json

@@ -1714,15 +1714,15 @@
     "mt": {
       "alias": "maltese"
     },
-    "nb": {
-      "alias": "norsk"
-    },
     "ne": {
       "alias": "nepali"
     },
     "nl": {
       "alias": "nederlands"
     },
+    "no": {
+      "alias": "norsk"
+    },
     "oc": {
       "alias": "occitan"
     },