Add several Malayo-Polynesian languages (#390)

mfa was requested for translatewiki:
https://phabricator.wikimedia.org/T376826

The rest were added recently to jquery.ime.

data/langdb.yaml

@@ -27,6 +27,7 @@ languages:
   ajp: [apc]
   ajp-arab: [apc]
   ajp-latn: [apc-latn]
+  akb: [Latn, [AS, PA], Batak Angkola]
   akz: [Latn, [AM], Albaamo innaaɬiilka]
   ale: [Latn, [AM, AS], unangam tunuu]
   ale-cyrl: [Cyrl, [AS], унаӈам тунуу]
@@ -121,8 +122,12 @@ languages:
   brh: [Latn, [ME, AS], Bráhuí]
   brx: [Deva, [AS], "बर'"]
   bs: [Latn, [EU], bosanski]
+  btd: [Latn, [AS, PA], Batak Dairi]
   btm: [Latn, [AS], Mandailing]
   bto: [Latn, [AS], Iriga Bicolano]
+  bts: [Latn, [AS, PA], Sahap Simalungun]
+  btx: [Latn, [AS, PA], cakap Karo]
+  btz: [Latn, [AS, PA], Batak Alas-Kluet]
   bug: [Latn, [AS, PA], Basa Ugi]
   bug-bugi: [Bugi, [AS, PA], ᨅᨔ ᨕᨘᨁᨗ]
   bug-latn: [bug]
@@ -485,6 +490,7 @@ languages:
   mcn: [Latn, [AF], vùn màsànà]
   mdf: [Cyrl, [EU], мокшень]
   mey: [Arab, [AF], الحسانية]
+  mfa: [Latn, [AS, PA], Klate-Ttaning]
   mfe: [Latn, [AM], Morisyen]
   mg: [Latn, [AF], Malagasy]
   mh: [Latn, [PA], Ebon]