Add Tai Nüa (tdd)

Requested for translatewiki at
https://translatewiki.net/wiki/Thread:Support/Tai_N%C3%BCa_Translation_Request

Autonym according to Ethnologue.

data/langdb.yaml

@@ -607,6 +607,7 @@ languages:
   ta: [Taml, [AS], தமிழ்]
   tay: [Latn, [AS], Tayal]
   tcy: [Knda, [AS], ತುಳು]
+  tdd: [Tale, [AS], ᥖᥭᥰᥖᥬᥳᥑᥨᥒᥰ]
   te: [Telu, [AS], తెలుగు]
   tet: [Latn, [AS, PA], tetun]
   tg-cyrl: [Cyrl, [AS], тоҷикӣ]
@@ -740,7 +741,7 @@ scriptgroups:
   SouthAsian: [Beng, Cakm, Deva, Gujr, Guru, Knda, Mlym, Mtei, Olck, Orya, Rohg, Saur, Sinh, Sylo, Taml, Telu, Tibt, Thaa, Wara]
   Cyrillic: [Cyrl]
   CJK: [Hani, Hans, Hant, Kore, Jpan, Yiii]
-  SouthEastAsian: [Bali, Batk, Bugi, Java, Khmr, Laoo, Lana, Mymr, Thai]
+  SouthEastAsian: [Bali, Batk, Bugi, Java, Khmr, Laoo, Lana, Mymr, Thai, Tale]
   Mongolian: [Mong]
   SignWriting: [Sgnw]
   NativeAmerican: [Cher, Cans]

data/language-data.json

@@ -3976,6 +3976,13 @@
             ],
             "ತುಳು"
         ],
+        "tdd": [
+            "Tale",
+            [
+                "AS"
+            ],
+            "ᥖᥭᥰᥖᥬᥳᥑᥨᥒᥰ"
+        ],
         "te": [
             "Telu",
             [
@@ -4667,7 +4674,8 @@
             "Laoo",
             "Lana",
             "Mymr",
-            "Thai"
+            "Thai",
+            "Tale"
         ],
         "Mongolian": [
             "Mong"
@@ -5015,6 +5023,7 @@
             "kk-arab",
             "kk-cyrl",
             "ky",
+            "tdd",
             "en",
             "ru",
             "vi",