I18n deployment 2012-05-22

The next i18n deployment is on Tuesday 2012-05-22 at 16:30-17:30 UTC

The plan:
* Merge Interwiki extension [1] into 1.20wmf3 branch, but not enable
the extension until 1.20wmf3 is deployed to all projects.
* Deploy various bug fixes to TranslationNotifications extension [2].

[1a] https://mingle.corp.wikimedia.org/projects/internationalization/cards/908
[1b] https://bugzilla.wikimedia.org/show_bug.cgi?id=22043
[2] https://mingle.corp.wikimedia.org/projects/internationalization/cards/907

  -Niklas