Copy translations of Special:MyLanguage alias from Translate

Tuvan (tyv) didn't have a special page section, so now it's added.

See also I6f84eaf414b6d4239522bad14e90b1cbfc82590f.

Bug: 69461
Change-Id: Ie6a4d878b87ee030f9c042b43f7b1fb424b54099