Starting from v1.8.0 you can choose the language of your Chat/Discord messages (eg restart warnings).
This option can be found at Settings > Global > Language.
If your language is not available, or you want to customize the messages, create a locale/custom.json file in your txData folder based on any language file found on our repository. Then go to the settings and select the "Custom" language option.
Note: If your language is not available in the list, feel free to do a Pull Request.