I realized I have to drop MediaWiki because my host didn't expose PHP proc_open() feature.
I don't even know where to start. A natively written syntax highlighter can be considered as an important brick in an ecosystem (GeSHi was used everywhere few years ago), but it looks like no-one is working on it anymore so MediaWiki did an strong technological move to use Python via a sub process.
This kind of move (dropping a existing natively written tool for a tool from another language) shows how bad the ecosystem situation is.