Update OOjs UI to v0.1.0-pre (51f513f9d3)

New changes:
8019b96 Localisation updates from https://translatewiki.net.
1fbe3cc Localisation updates from https://translatewiki.net.
455bbb5 Localisation updates from https://translatewiki.net.
379c9da Localisation updates from https://translatewiki.net.
ff74dc3 Fix CSS transplantation in IE
5de13ef Localisation updates from https://translatewiki.net.
44fafb5 Fixing formatting of Agora (mobile) dialogs
d9b7f6a Adjust for border with box-sizing: border-box
a942c71 demos: Refactor tool groups to be re-usable between toolbars

Change-Id: I0ce44be7ecd8ab6fc0693c23bca22d1a8286e383