PS mw.wikibase is a part of the Extension:Wikibase Client.

I believe what you want to be enabled is what we call arbitrary access. To confirm can you please link to a page on English Wiktionary that has what you want to replicate?

Module:languages

Data to be used are already from Category:Language data modules

There are modules in the same names at thwikt.

Per https://meta.wikimedia.org/wiki/Requesting_wiki_configuration_changes, please provide us a link to a community consensus, thanks !

Ok it seems like this is about arbitrary access indeed then. Thank you!
As @Framawiki said it'd be great if you could point to a community discussion for it.

There is no discussion at thwikt yet. But there is a discussion at enwikt about big changes in data structure last week that applies the extension mw.wikibase on every page. https://en.wiktionary.org/wiki/Wiktionary:Grease_pit/2018/February#light_and_Lua_error:_not_enough_memory And then thwikt follow it. Current status at thwikt is to modify enwikt's source code that directly links to the Wikidata's "Q" page instead of its sitelink (AKA the relevant Wikipedia's article which should be more useful for readers).

@Octahedron80 This should work now as the father task T175273 is resolved now.