Overview of changes in 3.5.91
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* Removed Twitter and Yahoo support. There are currently no known applications
  that use it, and we need to get the terms and conditions reviewed by the SFLC
  anyway. Will be restored once the situation changes.

* Updated translations:
 Arabic
 Assamese
 Traditional Chinese (Hong Kong)
 Traditional Chinese (Taiwan)
 English (British)
 Galician
 Greek
 Hungarian
 Indonesian
 Lithuanian
 Norwegian bokmål
 Polish
 Punjabi
 Russian
 Spanish
 Vietnamese