TNL-1010: update final UI text strings.
Merge pull request #6381 from edx/anton/edxnotes-ui-strings

[WIP] TNL-1010: update final UI text strings.
TNL-930: Turn off Student Notes when HAT is enabled.
Merge pull request #6340 from edx/anton/harvard-tool-student-notes

TNL-930: Turn off Student Notes when Harvard Annotation Tool is enabled.
LMS: adding/organizing utility-based navigation HTML
LMS: adding/organizing utility-based navigation styling
LMS: revising course styling compile + (adding student-notes module)
LMS: styling student notes error/alert
LMS: customizing annotator vendor styling/UI - error message
LMS: adding in active state styling/markup for utility nav
Add stateful classes.