The popup label was being styled as two words from two different
i18n messages, each a different colour. This combines them into
one, moves the identifing class name up to the outer span, and
colours both words blue (the outer braces are left black).
Bug: T174219
Change-Id: Id1166f48ae4b3b8daff29be56dd92ef330dd9cef
Long-term todo:
* Performance will be poor on large pages due
to using a auto-height textarea which CodeMirror
doesn't optimise.
Change-Id: I16598fcdbeee51e6fae88376ec81f1c8552b383d
Use a message, that explains a bit more, what CodeMirror is and indicate
what the button do exactly.
Change-Id: If8a0a8261cd811407cff4868dcf6475335b3f752
