Add the Fang language

The autonym is taken from "Diccionario español-fang/fang-español",
by Julián-Bibang Bibang Oyee

data/langdb.yaml

@@ -157,6 +157,7 @@ languages:
   ext: [Latn, [EU], estremeñu]
   eya: [Latn, [AM], I·ya·q]
   fa: [Arab, [AS, ME], فارسی]
+  fan: [Latn, [AF], Faŋ]
   fax: [Latn, [EU], Fala]
   ff: [Latn, [AF], Fulfulde]
   fi: [Latn, [EU], suomi]

language-data.json

@@ -977,6 +977,13 @@
             ],
             "فارسی"
         ],
+        "fan": [
+            "Latn",
+            [
+                "AF"
+            ],
+            "Faŋ"
+        ],
         "fax": [
             "Latn",
             [
@@ -4613,6 +4620,7 @@
         ],
         "GQ": [
             "es",
+            "fan",
             "fr",
             "pt"
         ],