Use postWithToken

This means that sandbox functionality depends on MediaWiki 1.22

Change-Id: Ia13f0afeb7debdbb645dc93bc14874f15188dd0b
Improvements to Special:ManageMessageGroups

* Better way of not having too many changes per page
* When the number of changes per group exceeded the limit, only one
  more change per group would be processed. All the remaining changes
  would be ignored and cause data to be out of sync.
* Immediately show more changes instead of confusing confirmation page
* Add a small note above submit button indicating that there will be
  more changes to review in case there are

Also includes a sanity check in FFS to avoid fatal errors if FFS types
get mixed.

Change-Id: I4f3efdfd60e468d1f74307f04213d2b934d17da5
Localisation updates from http://translatewiki.net.

Change-Id: I5310ec00ff263737bfd11e1c3f249163b079176a
Merge "Use postWithToken"
User postWithToken for saving translations of sandboxed users

Change-Id: I8409fde1a148d34aa75815e37f50396e4ae90f37
Use autonym class for tagcloud in Special:SupportedLanguages

Depends on ULS: I58c9c3fb74774e26e0f680cec0b0f9b2d3b2c11c

Change-Id: Ic25162956efdc1d666cccc5c48e3f79bf38ba321
Merge "Improvements to Special:ManageMessageGroups"
Add missing i18n for percentage

Change-Id: I808cdcf76af5eec78816608a39283a9c8aabbae0
Merge "Add missing i18n for percentage"
Merge "Use autonym class for tagcloud in Special:SupportedLanguages"
Merge "User postWithToken for saving translations of sandboxed users"
Quick fix fuzzy.php: getArg takes index, convert input to array

Change-Id: Ia0dcd178039d55dbe179af7ea1d83da892f52932
Merge "Quick fix fuzzy.php: getArg takes index, convert input to array"
Fix regression in Ifde21874 originally fixed in I18c885ca

Change-Id: I4a6c766ea72767132cd96197d9006a9a835038fa
Styling review for translator stash editor

CSS adjustments to:
* Hide irrelevant information for the task (list of messages, close action
  and edit documentation link)
* Align editor
* Other layout and colour adjustments

Change-Id: Iebd1f47eb7d3ea16257f4763c8b3c4410925742d
Merge "Styling review for translator stash editor"
Change wording of welcome note as recommended by Pau

Change-Id: I533b8e66d458a8b4e5ccb77b8142491f5cd0292d
Browser tests for translation stash

Change-Id: I1cb655aa70044e6627d47556b9ea8af240db418e