When both Sage tongues and Polymorph are active, The character is unable to correctly speak or translate foreign languages. Canceling the polymorph to return to your regular form will let you speak the language correctly.
Steps to reproduce the Bug:
Be a lvl 27 warlock with Dark incantation: Sage tongues
Cast Sage Tongues
Cast Polymorph self or Wildshape
Speak an unknown language
Expected Result:
The language is correctly spoken and translated.
Actual Result:
Only partial translation from lore, Sage tongues is not active.
Screenshot(s)

Additional Information/Notes
Tested on UD and Surface servers
Also unable to translate letters on boards when polymorphed, by can in human form.
:)