Compression Fix

A ‘;’ was missing.
Language Update for Translation
Error Handling for Runtime Errors

When using AJAX, do not put much output back to the client when errors
occur.
Better debugging & BugFix for non-AJAX calls
Enable authenticated Exports

It is now possible to export restricted namespaces and pages as long as
you can authenticate with a user that has DELETE access to the wiki.
The credentials will be forwarded the first time a request is made (if
not exporting via AJAX) so all the subsequent requests are
authenticated (via Cookie).