Review error messages and UI text
Edit error messages in .py files
Corrected tiny typo in models.py
Revise UI and error message text in .js files
Updated "Could not contact server" error messages
UI and error message text updates
Merge pull request #255 from edx/sylvia/docs/API-UI-text

Sylvia/docs/api ui text
Fix for TIM-449. Do not use Peer UUID