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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Encode unsafe characters in interwiki links. closes #1220

Unit test for interwiki URL encoding bug

Change interwiki links to HTTPS

improve aria attribute handling. closes #1142

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

remove pragma:no-cache header. closes #1201

The pragma header is only defined for requests not for responses. The
Cache-Control header should be used in responses.

Add a 'returnonly' option to all xhtml link types

translation update

translation update

no syntax highlighting, it attracts too much readers attention

Better suggestion for changing warning for nosmblink in browsers

Improves syntax page due to feedback at #1233

fixed a few links and html errors in language files

fixed some wrong quotation marks in language files

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

removed English translation strings from non-English translation files

fixed lots of missing format strings in language files

refactored tpl_actiondropdown() to avoid duplication

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"