AFAIK @devincent works on Switzerland instance (not Belgium) so French/German/Italian + one more less common language.
@maikel made comment about dynamic switching of languages in Internationalisation project notes
Maybe he could create github issue with more technical details as a reference for potential developers. This discussion here could focus on non technical aspects. For example:
- expected interaction experience
- only multilingual interface or also multilingual content
- who could work on it and various funding related discussions