How to change langugages?

Chavo by default fCommunity offer one language for the whole community but you can translate plugin to other language - you can do it on your own or wait until there will be a language pack in the WP .org repo available (this is up to wp community users).

You can translate fCommunity plugin with Loco Translate (here is how to do it) or any other similar plugin - if you notice some phrases that cannot be translated please share your list of "words" on this forum - see how Aaron did it here

If you would like to have multilingual fCommunity then you need some extra work since posts/comments cannot be translated easily out of the box.