Create a copy of locales/en.json and rename it to your language code
( etc. Dutch --> nl.json )
Now translate each string in the file to your language!
Finally set Config.Locale found in the config to your language code. For example:
Config.Locale = "nl"
We recommend joining our Discord to see if other customers have already created the language you're looking for. You can also get additional support from the community and our team there.