Register missing messages for mediawiki.special.upload

Follows-up I43bf828654d342893a19656ddd4151c2558d2f63.
The confirm close needs messages and jQueryMsg for parsing "int:".

Change-Id: If9a69749dcff2196dfe51a4484c6faeb98674ffa
Merge "Register missing messages for mediawiki.special.upload"