- Corrected the direction of the English equations
  - TNL-3798: Removed the greek letters
  - The equal (=) button is now the default submit button in the calculator, instead of the help button
  - TNL-3798: Removed the subscript note
  - Added some comments for the translators in the calculator
  - Using `fixed` position for the calculator for best mobile/desktop look

TNL-1957

TNL-1958

TNL-3821

Content that doesn't fit on the screen was causing the viewport to be
the wrong size on mobile devices resulting. This forces wrapping for
long content instead of letting it force the viewport size.

JIRA: https://openedx.atlassian.net/browse/MA-1236

This was originally contributed upstream by Stanford, circa 2013.

We neither use nor support this feature in its current implementation,
and in fact, we may never have used this production. Until recently, we
had additional chat/Jabber code [1] (in the form of a Jabber djangoapp in
LMS); context there suggests this feature may have never been more than
a prototype. The original author is no longer on the team, so I can't directly
confirm this on our end.

Do you use this feature?

Stanford had already abandoned this Jabber-backed chat implementation,
in favor of an IRC backend, by the time I joined the team in early 2014.

[1] https://github.com/Stanford-Online/edx-platform/commit/dbe52a6b133ab6ff637dea5324f7322da2909070

Clarify and reformat some comments; rename a few functions to clarify those.

Convert tabs to spaces.

Fix inaccurate comment

Fixed jshint issues

Adjust how user-select is applied to the gradebook view. Add i18n for a string.

Allow selection when not dragging.

Discussion forum styling cleanup to correct current visual styling issues in addition to cleaning up styles in preparation  for adding post images