See "Prioritizing MediaWiki’s translation strings"
http://laxstrom.name/blag/2015/02/19/prioritizing-mediawikis-translation-st…
It's quick enough to bring your language (back) to the top, probably few
hours. :) Translate, as always, at:
https://translatewiki.net/wiki/Special:Translate/core-0-mostused
Nemo