MSIE 11 tries hard to break any previous working browser detection
even through feature checks. This resolves to browser sniffing (MSIE for
old IE, Trident for IE11+)

See https://forum.dokuwiki.org/thread/10824

As suggested by @selfthinker

The regex wasn't properly escaped here which lead to problems when the
path contains backslashes. This is the root cause of the bug reported
at https://github.com/cosmocode/edittable/issues/19

In Novell eDir the group search returns strings, not arrays. Added if-statement which determines if the result is an array or an string.

fix bug that only allows admins any AJAX calls

In most cases this change will have no effect, but noes the response will use the filename that was originally requested. The downloaded filename can be modified to something different as well. E.g. the siteexport plugin will make use of it.

our translation interface used to submit empty files for a while but no
longer does, so these can go