-Modified subtitles to use locale rather than language code.

-Fixed locale parsing for youtube.

src/main/java/org/schabi/newpipe/extractor/Subtitles.java

@@ -6,24 +6,22 @@ import java.io.Serializable;
 import java.util.Locale;
 
 public class Subtitles implements Serializable {
-    private final static String AUTO_GENERATED_TAG = " (auto-generated)";
-
     private final SubtitlesFormat format;
-    private final String languageCode;
+    private final Locale locale;
     private final String URL;
     private final boolean autoGenerated;
 
-    public Subtitles(SubtitlesFormat format, String languageCode, String URL, boolean autoGenerated) {
+    public Subtitles(SubtitlesFormat format, Locale locale, String URL, boolean autoGenerated) {
         this.format = format;
-        this.languageCode = languageCode;
+        this.locale = locale;
         this.URL = URL;
         this.autoGenerated = autoGenerated;
     }
 
     public SubtitlesFormat getFileType() { return format; }
 
-    public String getLanguageCode() {
-        return languageCode;
+    public Locale getLocale() {
+        return locale;
     }
 
     public String getURL() {
@@ -33,9 +31,4 @@ public class Subtitles implements Serializable {
     public boolean isAutoGenerated() {
         return autoGenerated;
     }
-
-    public String getDisplayName() {
-        final Locale locale = new Locale(languageCode.replace("-", "_"));
-        return locale.getDisplayLanguage() + (isAutoGenerated() ? AUTO_GENERATED_TAG : "");
-    }
 }

src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeStreamExtractor.java

@@ -775,16 +775,21 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         final String languageCode;
         final boolean isGenerated;
 
+        final Locale locale;
+
         public SubtitlesInfo(final String baseUrl, final String languageCode, final boolean isGenerated) {
             this.cleanUrl = baseUrl
                     .replaceAll("&fmt=[^&]*", "") // Remove preexisting format if exists
                     .replaceAll("&tlang=[^&]*", ""); // Remove translation language
             this.languageCode = languageCode;
             this.isGenerated = isGenerated;
+
+            final String[] splits = languageCode.split("-");
+            this.locale = splits.length == 2 ? new Locale(splits[0], splits[1]) : new Locale(languageCode);
         }
 
         public Subtitles getSubtitle(final SubtitlesFormat format) {
-            return new Subtitles(format, languageCode, cleanUrl + "&fmt=" + format.getExtension(), isGenerated);
+            return new Subtitles(format, locale, cleanUrl + "&fmt=" + format.getExtension(), isGenerated);
         }
     }