[youtube] Fix subtitle names for age-gated videos

Related: https://github.com/iv-org/invidious/pull/2205#issuecomment-868680486

yt_dlp/YoutubeDL.py

@@ -3084,7 +3084,7 @@ def list_subtitles(self, video_id, subtitles, name='subtitles'):
             'Available %s for %s:' % (name, video_id))
 
         def _row(lang, formats):
-            exts, names = zip(*((f['ext'], f.get('name', 'unknown')) for f in reversed(formats)))
+            exts, names = zip(*((f['ext'], f.get('name') or 'unknown') for f in reversed(formats)))
             if len(set(names)) == 1:
                 names = [] if names[0] == 'unknown' else names[:1]
             return [lang, ', '.join(names), ', '.join(exts)]

yt_dlp/extractor/youtube.py

@@ -2307,7 +2307,9 @@ def process_language(container, base_url, lang_code, sub_name, query):
                         continue
                     process_language(
                         automatic_captions, base_url, translation_language_code,
-                        try_get(translation_language, lambda x: x['languageName']['simpleText']),
+                        try_get(translation_language, (
+                            lambda x: x['languageName']['simpleText'],
+                            lambda x: x['languageName']['runs'][0]['text'])),
                         {'tlang': translation_language_code})
                 info['automatic_captions'] = automatic_captions
         info['subtitles'] = subtitles