Hi, I don't know if it helps at all (or if there's a better way), but you can find translation data on GitHub:
http://github.com/travisbell/tmdb-web-translations/blob/main/locales/fr-FR.yml

Thanks a lot but no, i mean about the informations of the movies of the database. For example a movie made in Belgium or a belgian actor is displayed "Belgium" (and not Belgique if we translate it in french). it is the same for the characters (for exemple when an actor play his own character, it is displayed as "Self" it is not translated in french (lui-même for a man, elle-même for a woman). it is the same for the functions, the jobs, the relationships ... Many many translations are not made. As the database has some millions of entries, it is impossible translate it one to one. I wanted to know if another solution existed

This file is a mapping of country codes to the names of countries in French:
http://github.com/travisbell/tmdb-web-translations/blob/main/countries/fr-FR.yml

As for the names of characters, TMDb only provides these in English. If you wish to translate "Self" to French, you'll need to detect this and translate it in your own software.

I believe that the only received item on which the translation is made is genre.
http://www.shbhawani.com/3/genres/get-movie-list
http://www.shbhawani.com/3/genres/get-tv-list
All others are not. Countries, languages, etc...
Of course, if it exists, you receive the following items in the selected language:
overview, tagline and title.
You can get the list of items used in TMDb, in English and or with ISO code.
http://www.shbhawani.com/3/configuration/get-countries
http://www.shbhawani.com/3/configuration/get-languages
http://www.shbhawani.com/3/configuration/get-primary-translations