Fix sanitation of $language for code highlighting (fixes #2080)

Support Web Video Text Tracks Format subtitles

Merge branch 'master' into actionrefactor

* master: (65 commits)
updated composer dependencies
Release preparation
translation update
do not disclose email or IP addresses of users through R

Merge branch 'master' into actionrefactor

* master: (65 commits)
updated composer dependencies
Release preparation
translation update
do not disclose email or IP addresses of users through RSS
small fix
Make default encapsulation more readable and less duplicate.
Replace htmlspecialchars to hsc in core
Add the preview-bool for the cache file.
Add htmlspecialchars when showing $DATE_AT
#2021 broken links to W3C validators also dokuwiki and php are on https
made bin/wantedpage.php more flexible
doc abbreviation
Fix PHP Notices: Reduce error log noise
Create valid empty options
translation update
doc fix
translation update
using $options->getCmd to retrieve show-pages parameter
added option to wantedpages.php to show or not show pages where broken links occur
show pages where broken links occur: page_id => broken_link
...

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Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could b

Fix PHP Notices: Reduce error log noise

While DokuWiki suppresses PHP Notices they are still a code smell and
should be fixed. This fixes some PHP Notices that occurred.

Some of these fixes could be refactored into nicer code once we move to
PHP 7 and get access to the `??` operator.

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Added support for additional geshi options using an extendable options array.

always redirect to correct section

Across workflow 'show - sectionedit - save/cancel' explicitly
transmit header id to the server. So the server can always redirect to
the correct section even if he

always redirect to correct section

Across workflow 'show - sectionedit - save/cancel' explicitly
transmit header id to the server. So the server can always redirect to
the correct section even if headings have the same name. Fixes #1364.

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Merge pull request #1771 from splitbrain/blanktitles

fix problems with header that look falsy. fixes #1770

Merge pull request #1548 from splitbrain/fix-broken-js-in-xhtml

Fix broken JS in xhtml

misspelled foot

added table footer support to renderer

This allows plugins to easily render a <tfoot> element in a table, even
though it's not used in standard table syntax it makes sense to have it
available.

fix problems with header that look falsy. fixes #1770

Implemented interwiki substitution for external images (issue #1614).

Merge pull request #1558 from splitbrain/syntaxtableclasses

Let plugin add their own classes to list/table created with doku's renderer methods

warn about classes to be valid

allow passing multiple classes as array

optional class for methods that open a table,row,cell,header, ul,ol

Let plugins add their own classes to builtin tables or lists.

Fixes #1188
Alternative for #1360 (and PR #1515)

Added getter function getLastlevel() in Doku_Renderer_xhtml.
This is required for the filelist plugin to fix issue #11 since $lastlevel became protected in "hrun".

changed footnote content to div

rewrote js for footnotes to work in xhtml

fixed typo from nofollow to noopener

add rel=noopener to links opening in new window

This is a security measurement supported in Chrome and Opera (and
probably other browsers soonish)

See http://mathiasbynens.github.io/rel-noopener/ f

add rel=noopener to links opening in new window

This is a security measurement supported in Chrome and Opera (and
probably other browsers soonish)

See http://mathiasbynens.github.io/rel-noopener/ for rationale

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Revert "Trim unnecessary / at start of windowssharelink"

Add 'returnonly' option even if no valid url is given

Add a 'returnonly' option to all xhtml link types

add missing tabletbody_open|close() to renderer