The current (WIP) code only shows DB names, so in production that would display something like "enwiki" or "ptwikibooks" or "commonswiki". What we'd like to show is human-readable names like "Wikipedia - English", "Wiktionary - Portuguese" or "Commons". @Pginer-WMF also suggested that if you're on a Wikpedia (and all wikis listed are Wikipedias?) we should simply display "English" rather than "Wikipedia - English".
See also: