These are the language options that Peertube supports:
arabic, english, french, german, hindi, italian, japanese, korean, mandarin, portuguese, punjabi, russian, spanish

enter one of them in the config.

You can also use these values in the config if you prefer:
ar, en, fr, de, hi, it, ja, ko, zh, pt, pa, ru, es

These are the categories Peertube supports:

music, films, vehicles, sport, travels, gaming, people, comedy, entertainment, news, how to, education, science & technology, animals