search in current message and see the firefox-alike search bar at the bottom with the "_back" and "fo_rward" buttons.

in this case, forward obviously means something different then "forwarding an email message", at least in german, "Forward" would be translated to two different words.
either perhaps change this to "next" and "previous" buttons, or use gettext context (that "|" thingy, remember?)!

note that any change here would mean either a UI or a string freeze break.