Language.yml:

You can edit the file as you wich in any language.
After you have made your changes you simply reload the plugin with: /bp reload

PS: If you are a native in any language other then English or French and want to help me you can translate the config file in your language.

Colourlanguage.yml:

Here you can modify the text that is displayed above the your health bar and the name of the block your holding.

You can find more thing about config at config