Revert "Additionally allow more media types" #982

This reverts commit de4634ec87b1a277c1686990d993dafc43db05ed.

fixed styling preview in IE

IE doesn't like it when you create a DOM element in one window and
try to insert it in another window.

translation update

translation update

added plugin to list of bundled extensions

added styler into default plugin section

The icon does not match the others because the NuvolaX icon theme seems
to have vanished from the Internet. Ideally all those admin icons could
use a replace

added styler into default plugin section

The icon does not match the others because the NuvolaX icon theme seems
to have vanished from the Internet. Ideally all those admin icons could
use a replacement. But that should be a different PR I guess.

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readded cookie to styling plugin

remove deleted files on update of extension

Resolves #1192

`/lib/plugins/<plugin>/deleted.files`
which list files that can be removed e.g.
```
# This is a list of files that were present in previou

remove deleted files on update of extension

Resolves #1192

`/lib/plugins/<plugin>/deleted.files`
which list files that can be removed e.g.
```
# This is a list of files that were present in previous plugin releases
# but were removed later. An up to date plugin should not have any of
# the files installed
action.php
folder/file.txt
```

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improve aria attribute handling. closes #1142

adds aria handling to makeToggle and allows to supress it in dw_toggle

translation update

translation update

fixed a few links and html errors in language files

fixed occurrences of html named entities in translation files to be xhtml-compatible

fixed lots of missing format strings in language files

changed all input type=submit buttons to button type=submit button for better stylability

translation update

adjust newline

translation update

translation update

added labels to form entries

improved various minor frontend issues in styling plugin

* improved spacing of popup
* made primary buttons clearer
* xhtml and validity fixes
* improved some lang strings
* moved 'open as popup' af

improved various minor frontend issues in styling plugin

* improved spacing of popup
* made primary buttons clearer
* xhtml and validity fixes
* improved some lang strings
* moved 'open as popup' after intro
* fixed page reload after clicking 'open as popup' button

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Update lang.php

Выравнивание и разбиение по образцу en/lang.php, унификация "директорий" и "папок", "расширений" и "дополнений"

fixed small spacing/alignment issues in display options of extension manager

fixed installed extensions in extension manager not displaying without JS

translation update