better resize handles in media manager

Merge HEAD, branch 'master' of github.com:lupo49/dokuwiki

improved media options css (and removed lots of dead css code)

added styles for general tabs (to be used in mediamanager and other components)

added clearfix-similar class (.group) to core styles

improved core .a11y class

improved words for different diff views of images

Increase compatibility in addEvent

Increase locktimer compatibility

Use jQuery UI Dialog for linkwiz

Readd variable declaration for plugin:sortablejs

Add jslint wrapper script

Various JavaScript improvements, JSLint, jQuery

pt-BR language update

ru: language updates (new strings of the Media Manager)

en/fr: language updates (new strings of the Media Manager)

pt language file updates

This commit adds new strings to the pt files which
have been introduced through the new Media-Manager.
(commit fb46ebd87eb43d5cd9f67f353f6656d0e3a0b196)

de/de-informal/en language file updates

This commit adds new strings to the de/de-informals files which
have been introduced through the new Media-Manager.

All lang.php-files in inside en/de/de-inf

de/de-informal/en language file updates

This commit adds new strings to the de/de-informals files which
have been introduced through the new Media-Manager.

All lang.php-files in inside en/de/de-informal have been
reordered and reformatted.

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media manager design: added icon to resizing handle and changed background colour

empty conf/plugins.local is created if not existing

media manager design: more spacing and some colour changes

Added comment in conf/plugins.local about how disabled files work

Removed tmp_bak array, no need for checking before save if anything changed

media manager design: improved some spacing

media manager design: added headline