This is the official TFA SWEP Base English localization file reference.

The base currently supports these languages officially:

English
Russian
French (slightly outdated)

Community-made Localization Packs:

Chinese Simplified: https://steamcommunity.com/sharedfiles/filedetails/?id=2728076873
German: https://steamcommunity.com/sharedfiles/filedetails/?id=3248370180

If you want to make a localization pack for the base, you need to follow these steps:

Make sure the language is supported by the game
Download the localization reference file
Put the file into <your new addon folder>/resource/localization/<language code> folder
Translate the lines. Please make sure to remove the untouched/unlocalized lines to allow proper English fallback in case of any changes.
Your localization pack is ready to use and for uploading to Steam Workshop! It will work on any server since this localization is only needed on the client.