add more about multilingualism

[maelle]

• translating messages thanks @pietrh for the idea
• Elio's project https://ropensci.org/blog/2024/02/23/news-february-2024/#progress-on-multilingual-help-support

[PietrH]

Let me know if you need any help.

[mpadge]

@PietrH Contributions via PR are always welcome and strongly encouraged, so please feel free to make suggestions yourself :+1: