feat(lang) add upper sorbian to transcription languages

* fix showing transcripts for country codes longer than 2 characters

lang/translation-languages.json

     "hi": "Hindi",
     "hmn": "Hmong",
     "hr": "Croatian",
+    "hsb": "Upper Sorbian",
     "ht": "Haitian Creole",
     "hu": "Hungarian",
     "hy": "Armenian",

react/features/subtitles/middleware.ts

             }
         }
 
-        // If the suer is not requesting transcriptions just bail.
-        if (json.language.slice(0, 2) !== language) {
+        // If the user is not requesting transcriptions just bail.
+        // Regex to filter out all possible country codes after language code:
+        // this should catch all notations like 'en-GB' 'en_GB' and 'enGB'
+        // and be independent of the country code length
+        if (json.language.replace(/[-_A-Z].*/, '') !== language) {
             return next(action);
         }
 

react/features/transcribing/jitsi-bcp47-map.json

     "hi": "hi-IN",
     "mr": "mr-IN",
     "hr": "hr-HR",
+    "hsb": "hsb-DE",
     "hu": "hu-HU",
     "hy": "hy-AM",
     "id": "id-ID",

react/features/transcribing/transcriber-langs.json

     "is-IS": "Icelandic (Iceland)",
     "it-IT": "Italian (Italy)",
     "lt-LT": "Lithuanian (Lithuania)",
+    "hsb-DE": "Upper Sorbian (Germany)",
     "hu-HU": "Hungarian (Hungary)",
     "nl-NL": "Dutch (Netherlands)",
     "no-NO": "Norwegian Bokmål (Norway)",