Yes, all the dialogue is in the json files in the "data" directory commonevents and map files specifically... if you know what to look for and want to spend the time translating it to the language you wish... You can edit those files in any free text editor (I use notepad ++ myself) or if you own RPG MAKER you can edit all text via it... You'd want to search any "code":401 = Dialogue line.
Unfortunately unlike RENpy the dialogue is not in chronological order or that easy to follow unless you really know RPGM code well... It is ordered by map and event id
SabreWulf what language you trying to translate to (Italian has already been translated for my renpy version)
Sorrow85 You can modify text in both but Renpy code was designed to be edited by a text editor so much easier to follow/understand what to change and flow of story