This commit replaces fa-file-text-o with fa-file-code-o which is a
better signal for the "view source" action. It also deletes a single
line comment that had suggested the change once we moved into font
awesome 4, which Aditya Bansal <adi.bansal241996@gmail.com> helped
out in doing, first via
91962aa6ab and most recently via
75ae94e459 with several commits in
between.
Follow up of commit 2a1305d. Replace all local variables named 'msgid'
with 'message_id' in all JS and HTML files, and adds a linter rule for
it as well.
Resolves#12952.