Refresh metadatas after changing language

Hi,

I recently installed Kodi on my smart TV and added my NAS as source for Tv Shows and films. Metadatas has been generated but in english (and I'm french).

I changed en/us to fr in add-ons parameters of The Movie DB and TVDB (2 addons there), then tried to clean up and refresh database in Kodi settings but it doesn't work, metadatas are still in english.

So how can I do this ? If I need to remove my source from Kodi (nas) first, can you tell me how to do it please ?

Thanks.