Lexeme

Enable

Lexeme entities can be enabled in the "feature" management tab for a wiki.

Once enabled you should see the WikibaseLexeme extension appear on your wikis Special:Version page.

Usage

You should be able to create Lexeme entities via Special:NewLexeme.

You can make use of the equivalent entities feature to set a property to use for language codes for lexeme.

The equivalent property on wikidata.org would be P218 (opens new window).

This will allow you to use items as languages, rather than specifying codes.