Add Hassaniya (mey)

Requested at
https://translatewiki.net/wiki/Thread:Support/Request_for_the_enabling_of_Hassaniya_in_TranslateWiki.

Name as in Ethnologue + article, as requested at
https://meta.wikimedia.org/wiki/Requests_for_new_languages/Wikipedia_Hassaniya

data/langdb.yaml

@@ -401,6 +401,7 @@ languages:
   map-bms: [Latn, [AS], Basa Banyumasan]
   mcn: [Latn, [AF], vùn màsànà]
   mdf: [Cyrl, [EU], мокшень]
+  mey: [Arab, [AF], الحسانية]
   mfe: [Latn, [AM], Morisyen]
   mg: [Latn, [AF], Malagasy]
   mh: [Latn, [PA], Ebon]

data/language-data.json

@@ -2597,6 +2597,13 @@
             ],
             "мокшень"
         ],
+        "mey": [
+            "Arab",
+            [
+                "AF"
+            ],
+            "الحسانية"
+        ],
         "mfe": [
             "Latn",
             [
@@ -6289,7 +6296,8 @@
         "SN": [
             "wo",
             "fr",
-            "ff"
+            "ff",
+            "mey"
         ],
         "SO": [
             "so",