Add Iraqi Arabic (acm)

Requested at
https://translatewiki.net/wiki/Thread:Support/Portal:Acm

Autonym according to Ethnologue, but shortened (without
the word "language").

data/langdb.yaml

@@ -5,6 +5,7 @@ languages:
   abs: [Latn, [AS], Bahasa Ambon]
   ace: [Latn, [AS, PA], Acèh]
   acf: [Latn, [AM], kwéyòl]
+  acm: [Arab, [ME], عراقي]
   ady: [Cyrl, [EU, ME], адыгабзэ]
   ady-cyrl: [ady]
   ady-latn: [Latn, [EU, ME], Adygabze]

data/language-data.json

@@ -43,6 +43,13 @@
             ],
             "kwéyòl"
         ],
+        "acm": [
+            "Arab",
+            [
+                "ME"
+            ],
+            "عراقي"
+        ],
         "ady": [
             "Cyrl",
             [