[bug 894929] Update FF logo on download button
[bug 892103] Fix product logos on mobile search
[bug 893742] Update forum notifications email
Fix: use current locale variable instead of request LANGUAGE_CODE.
[bug 896477] Add link from l10n dashboard to l10n team.

* Added a sidebar nav to go back and forth.
[bug 897291] Tweak ES MLT error messages

This should let them aggregate correctly in sentry so we can better
see what's going on.
[bug 889814] Setup infrastructure for Persona auth