Label Refactor

[manfromjupyter]

Closes #771 and partially #639

Will address #850 after this.

DONE

1. All labels appropriately written using semantic <label>
2. New labels added to many fields and all now are supporting blind users using screen readers more appropriately.
3. ID's moved to front of attributes for easier readability.
4. All required attributes written as requires="required"
5. Fixed numerous places where classnames were not written in SLIM HTML format ex. div.classname1.classname2
6. Fixed misalignment of search help tooltip on non-home page search bars.
7. Changed "User name" on User Edit form to "Username" to match the rest of our front end.