Add Northern Tujia (tji) (#368)

It has been enabled on translatewiki.net for several
years, and should be included in ULS, too.

data/langdb.yaml

@@ -740,6 +740,7 @@ languages:
   th: [Thai, [AS], ไทย]
   ti: [Ethi, [AF], ትግርኛ]
   tig: [Ethi, [AF], ትግረ]
+  tji: [Latn, [AS], bifzivsar]
   tk: [Latn, [AS], Türkmençe]
   tkr: [Cyrl, [AS], цӀаӀхна миз]
   tl: [Latn, [AS], Tagalog]

data/language-data.json

@@ -4670,6 +4670,13 @@
             ],
             "ትግረ"
         ],
+        "tji": [
+            "Latn",
+            [
+                "AS"
+            ],
+            "bifzivsar"
+        ],
         "tk": [
             "Latn",
             [