Add the Kom language (bkm)

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

Autonym as used in the introduction to
Provisional Kom - English Lexicon by Randy Jones (2001),
and confirmed by a native speaker.

data/langdb.yaml

@@ -81,6 +81,7 @@ languages:
   bho: [Deva, [AS], भोजपुरी]
   bi: [Latn, [PA], Bislama]
   bjn: [Latn, [AS], Banjar]
+  bkm: [Latn, [AF], Itaŋikom]
   blc: [Latn, [AM], ItNuxalkmc]
   bm: [Latn, [AF], bamanankan]
   bn: [Beng, [AS], বাংলা]