Add Mansi (mns) (#387)

Downstream task:
https://phabricator.wikimedia.org/T375944

Co-authored-by: SrishAkaTux <ssethi@wikimedia.org>

data/langdb.yaml

@@ -502,6 +502,7 @@ languages:
   mnc-latn: [Latn, [AS], Manju gisun]
   mni: [Mtei, [AS], ꯃꯤꯇꯩ ꯂꯣꯟ]
   mni-beng: [Beng, [AS], মেইতেই লোন্]
+  mns: [Cyrl, [EU, AS], ма̄ньси]
   mnw: [Mymr, [AS], ဘာသာမန်]
   mo: [Cyrl, [EU], молдовеняскэ]
   moe: [Latn, [AM], innu-aimun]

data/language-data.json

@@ -3139,6 +3139,14 @@
             ],
             "মেইতেই লোন্"
         ],
+        "mns": [
+            "Cyrl",
+            [
+                "EU",
+                "AS"
+            ],
+            "ма̄ньси"
+        ],
         "mnw": [
             "Mymr",
             [