Bug 11559 - QA followup: fix several interface and backend issues

Switches to Bootstrap modals, and removes the now-unused
jquery.lightbox_me and jquery.hotkeys plugins. CodeMirror was switched
to a minified version (require already was, pz2 is a custom version, and
filesaver is so small that it wouldn't offer much benefit). Also shows
proper errors for failure to access Pazpar2 and when a user attempts to
transition a Z39.50 record from the basic to the advanced editor.
Finally, the alert log is now kept in a dropdown on the toolbar rather
than the default location.

(Also, a translation issue with the page title was fixed.)