This commit adds new strings to the pt files which
have been introduced through the new Media-Manager.
(commit fb46ebd8)

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.

when saving plugin.local

Plugins with a disabled file will be treated as having an entry (=0) in
conf/plugins.default.php overridable by conf/plugins.local.php

Function get_plugin_components() moved to extantion manager

This reverts commit ba6c070e.
This reverts commit 92351008.

Before it was possible that changes for media files the user can't
access were shown if the user could access a page with the same name.
This also reverts the file existence check so it now really checks for
media changes that the media file exists and for page changes the page
and that not one of the two suffice for both.