Update OOjs UI to v0.1.0-pre (ac6848398c)

New changes:
dbfade7 Localisation updates from https://translatewiki.net.
b541846 Remove grey background from disabled MenuToolgrop in apex
1367d62 Localisation updates from https://translatewiki.net.
0e4427d Make field labels appear disabled in sync with the field
ac68483 Get rid of useless comments for classes

Change-Id: I39e37060df2b52749b93b3918564691bf1725edb