Hi, I’m quite late to the game but I’m also interested in the (1) idea: collapsable sections per language.
My community background: users mostly live in Norway and some of them are more comfortable reading Norwegian (not that they cannot read English, they just prefer their mother tongue). The collapsable Norwegian section, thus, will work best for long topics such as in the Documentation category.
But I’ve browsed this topic and seems like we have not got a way to realize this (1) dream?