Add Kʋsaal and Dagaare languages

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

Autonym according to Ethnologue.

data/langdb.yaml

@@ -165,6 +165,7 @@ languages:
   de-ch: [Latn, [EU], Schweizer Hochdeutsch]
   de-formal: [Latn, [EU], Deutsch (Sie-Form)]
   de: [Latn, [EU], Deutsch]
+  dga: [Latn, [AF], Dagaare]
   din: [Latn, [AF], Thuɔŋjäŋ]
   diq: [Latn, [EU, AS], Zazaki]
   doi: [Deva, [AS], डोगरी]
@@ -351,6 +352,7 @@ languages:
   ku: [ku-latn]
   ku-arab: [Arab, [EU, ME], كوردي]
   ku-latn: [Latn, [EU, ME], kurdî]
+  kus: [Latn, [AF], Kʋsaal]
   kum: [Cyrl, [EU], къумукъ]
   kv: [Cyrl, [EU], коми]
   kw: [Latn, [EU], kernowek]