First export of Karelian language was made with I4174fc3bca40d45f06dd93af10d009d23acae375.
Now it's time to add Karelian to MediaWiki core.
In languages/data/Names.php:
'krl' => 'karjal', # Karelian
In RELEASE-NOTES-1.28, section "Languages updated in 1.28":
** krl (Karelian ), thanks to translators Flrn, Ilja.mos, Likopiän tyttö, Mashoi7, Matma Rex, Ontoi, Theunitedstatesofme, and Varvana
Fallback language: fi