upgrade to jQuery 1.11.1 and jQuery-UI 1.11.0. #778

This now pulls all data from official jQuery sources. Either their CDN
or their github account. Google tends to serve outdated or even broken
files :-(

Unfortunately there's no simple way to get the latest stable jQuery-UI
so for now the version has to be adjusted manually in the script.
Merge pull request #788 from splitbrain/jquery

  update jquery and jquery-ui
fix mediamanager messages. closes #792
recheck auth in media_delete

Sometime the passed AUTH was not correct. This is a quick fix,
but the whole media manager handling is one stining pile of crap that
needs a major rewrite.
better NS check in media_delete

as discussed in 22db8df7a2f043e38437a49bb327354b2a296bf0
translation update
Merge pull request #820 from dokuwiki-translate/lang_update_118

Translation update (bn)