Update autonyms for Altai languages

Requested by the speakers. "alt" is the main literary language,
so it's called just "Altai", and the word "language" is necessary,
similarly to how it's done in the related Sakha and Tuvan languages.

data/langdb.yaml

@@ -16,7 +16,7 @@ languages:
   ak: [Latn, [AF], Akan]
   akz: [Latn, [AM], Albaamo innaaɬiilka]
   aln: [Latn, [EU], Gegë]
-  alt: [Cyrl, [EU, AS], тÿштÿк алтай]
+  alt: [Cyrl, [EU, AS], алтай тил]
   am: [Ethi, [AF], አማርኛ]
   ami: [Latn, [AS], Pangcah]
   an: [Latn, [EU], aragonés]
@@ -36,7 +36,7 @@ languages:
   ase: [Sgnw, [AM], American sign language]
   ast: [Latn, [EU], asturianu]
   atj: [Latn, [AM], atikamekw]
-  atv: [Cyrl, [EU, AS], тÿндÿк алтай]
+  atv: [Cyrl, [EU, AS], тÿндÿк алтай тил]
   av: [Cyrl, [EU], авар]
   avk: [Latn, [WW], Kotava]
   awa: [Deva, [AS], अवधी]

data/language-data.json

@@ -120,7 +120,7 @@
                 "EU",
                 "AS"
             ],
-            "тÿштÿк алтай"
+            "алтай тил"
         ],
         "am": [
             "Ethi",
@@ -262,7 +262,7 @@
                 "EU",
                 "AS"
             ],
-            "тÿндÿк алтай"
+            "тÿндÿк алтай тил"
         ],
         "av": [
             "Cyrl",