Add Altay languages

Used in the Wikimedia Incubator and in translatewiki.

data/langdb.yaml

@@ -16,6 +16,7 @@ languages:
   ak: [Latn, [AF], Akan]
   akz: [Latn, [AM], Albaamo innaaɬiilka]
   aln: [Latn, [EU], Gegë]
+  alt: [Cyrl, [EU, AS], тÿштÿк алтай]
   am: [Ethi, [AF], አማርኛ]
   ami: [Latn, [AS], Pangcah]
   an: [Latn, [EU], aragonés]
@@ -34,6 +35,7 @@ languages:
   ase: [Sgnw, [AM], American sign language]
   ast: [Latn, [EU], asturianu]
   atj: [Latn, [AM], atikamekw]
+  atv: [Cyrl, [EU, AS], тÿндÿк алтай]
   av: [Cyrl, [EU], авар]
   avk: [Latn, [WW], Kotava]
   awa: [Deva, [AS], अवधी]