[LOCALE] More languages wanted ! Translators needed.

This bot uses a `yaml` file to store all the messages.

To add new languages, add a line in the `LANG` section, and a full section with the language below.

The language selection is made in the `utils.SelectLang` function.
For contributors: if you don't want to touch the GO part of the code, doing the translation alone is fine. I can do the rest 😃.

Current languages:
- [x] 🇺🇸 EN By : @auyer
- [x] 🇧🇷 PT/BR By : @auyer
- [x] 🇪🇸 ES By : @Guerlainn
- [x] 🇫🇷 FR By : @sheldoncoupeheure
- [ ] 🇩🇪 DE By :
- [ ] 🇯🇵 JP By :
- [ ] 🇮🇹 IT By :

Different language ? Suggest one in the comments!

Start with the YAML messages file described in the issue and read the LANG section alongside utils.SelectLang. Add the requested language entry and its complete translated section; done means the messages are present and the language can be selected without changing the Go code.

Written by the indexing model from the issue text.