Thank you very much for your feedback apollo2k9.
1) The mmdb plugin is ‘translation ready’. In other words, all the mmdb plugin language labels visible in the front and backend should be translatable via language files (PO / MO files).
There are many 3rd party plugins in wordpress that help you translate, one example would be to use the Loco Translate plugin to accomplish this.
The translation ready labels available can be seen in wp-content/plugins/my-movie-database/languages/my-movie-db.pot
2)
a-) Option to insert his insert his own tmdb api: Yes I agree. This was the plan but I never finished it. This will be in the next update.
b-) Option to “set a language code” for TMDb data: Right now, the mmdb plugin ‘sees’ the language selected by the user in the frontend and requests the data in the same language from TMDb.
Is this not working for you? Would you want to have an option to ‘force’ data coming from TMDb to be in a different language than the selected one?