Annotation Tools: Fix delete bug and factor out xmodule settings

Removed print context

- Fixed camel case for variable name
- Fixed indentation in imageannotation.html
- Changed all mentions of Instructor Username to Email
- Turned annotation_mode into phrase
- Fixed indentation in imageannotation.html
- Added comments in imageannotation.html

- Changing annotation_mode in OSDA

Annotation Tools PR Fixes

- forgot to overwrite the previous line

Improve escaping in code response.

Allow the video player to work with links with redirection.

Don't show duplicate JIRA tickets in the release PR table

Fixes delete page confirmation text.

prevent caching of GET requests for xblock student view

Removes Conrad's name from the course schedule settings (STUD-1511).

Skip intermittently failing video test

STUD-1691

make only section name in headers editable

STUD-1679

Fix some translation tags

Ahodges/documentation/doc502

Improve handling of bad JSON from comments service

load js without specifying protocol

ORA2 AI Grading Settings

Instead of allowing the JSONDecodeError to escape, raise an error
indicating the request id and containing the first 100 characters
of the response to aid investigation.

Added prototype DoneXBlock and AudioXBlock

Allow consumption of environment variables in docs Makefiles

Added ORA2_FILE_PREFIX setting