Add five languages of Taiwan

ais, ami, tay, trv, xsy

For reference, see
https://translatewiki.net/wiki/Thread:Support/Request_4_languages_of_Indigenous_Taiwanese

data/langdb.yaml

@@ -12,10 +12,12 @@ languages:
   aeb-latn: [Latn, [AF], Tûnsî]
   af: [Latn, [AF], Afrikaans]
   ahr: [Deva, [AS], अहिराणी]
+  ais: [Latn, [AS], Sakizaya]
   ak: [Latn, [AF], Akan]
   akz: [Latn, [AM], Albaamo innaaɬiilka]
   aln: [Latn, [EU], Gegë]
   am: [Ethi, [AF], አማርኛ]
+  ami: [Latn, [AS], Pangcah]
   an: [Latn, [EU], aragonés]
   ang: [Latn, [EU], Ænglisc]
   anp: [Deva, [AS], अङ्गिका]
@@ -482,6 +484,7 @@ languages:
   sxu: [Latn, [EU], Säggssch]
   szl: [Latn, [EU], ślůnski]
   ta: [Taml, [AS], தமிழ்]
+  tay: [Latn, [AS], Tayal]
   tcy: [Knda, [AS], ತುಳು]
   te: [Telu, [AS], తెలుగు]
   tet: [Latn, [AS, PA], tetun]
@@ -503,6 +506,7 @@ languages:
   tr: [Latn, [EU, ME], Türkçe]
   trp: [Latn, [AS], Kokborok (Tripuri)]
   tru: [Latn, [AS], Ṫuroyo]
+  trv: [Latn, [AS], Sediq Taroko]
   ts: [Latn, [AF], Xitsonga]
   tsd: [Grek, [EU], Τσακωνικά]
   tt: [Cyrl, [EU], татарча]
@@ -543,6 +547,7 @@ languages:
   xal: [Cyrl, [EU], хальмг]
   xh: [Latn, [AF], isiXhosa]
   xmf: [Geor, [EU], მარგალური]
+  xsy: [Latn, [AS], SaiSiyat]
   ydd: [Hebr, [AS, EU], Eastern Yiddish]
   yi: [Hebr, [ME, EU, AM], ייִדיש]
   yo: [Latn, [AF], Yorùbá]