Is the mod from the ingame mod manager or you can find that one in nexus too? Theres a folder called Localization, there is where you can add the right folder for the language and the loca file with the translation, you can check the wiki for more info about mods and unpack a mod from nexus that do what you wanna do, so you can check the files. Otherwise the other option would be ask te modder if he would willing to patch the mod with your translation.
