Add Special:SearchTranslations to wiki page group

Change-Id: I94e093ce24bc2d54820a3e0c25d574bb29cbcb19
Add special page group for SupportedLanguages

Page is no longer unlisted. This was changed in
28d377b2e287174a3bf05f3b5112aec801e7b6d5.

Change-Id: Idcce33b2b0c4563ccd90d87c04a65557434bb7e3
Merge changes Idcce33b2,I94e093ce

* changes:
  Add special page group for SupportedLanguages
  Add Special:SearchTranslations to wiki page group