fix global access on detail.php and avoid null loading

Another problem surfaced in the tests

fix undefined array warning in fulltext indexer

This was surfaced on PHP8 and might actually have been a bug before.

fix PHP8 errors in tests

These were problems within the tests itself. There are many more
problems in the actual code.

add needed type hints for phpunit8

This will break a lot of plugin tests, but can't be avoided

remove unnamespaced php unit wrapper

default to phpunit8 now

translation update

Fix TOC being cut off in `export_xhtml` mode

Fix page's background colour in `export_html` mode

When using the `export_html` mode (page without surrounding layout)
the page's background colour is grey with a gradient.
That is the same backgrou

Fix page's background colour in `export_html` mode

When using the `export_html` mode (page without surrounding layout)
the page's background colour is grey with a gradient.
That is the same background that the page with layout has
but different to the background the text is on.
What you would want is the same colour the text is on, which is white.

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Remove ! operator causing unit tests to fail

Fix Undefined array key in xhtml.php

Fix undefined array keys when displaying images

Fix undefined array keys when displaying revisions

Improve wording of Logviewer plugin intro text

Fix Undefined array key in Search/Indexer.php

Fix Undefined array key warnings in template.php

Warning: Undefined array key "__background__" in .../inc/ on line 1275

Triggered for the following language strings: __text__, __background__,
__tex

Fix Undefined array key warnings in template.php

Warning: Undefined array key "__background__" in .../inc/ on line 1275

Triggered for the following language strings: __text__, __background__,
__text_alt__, __background_alt__, __text_neu__, __background_neu__,
__border__ and __highlight__.

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Fix warning when displaying PDF in Media manager

Trying to access array offset on value of type bool in
.../inc/JpegMeta.php on line 1322

Fix Undefined array key "DOKU_PREFS" in common.php

Fix Undefined array keys in Diff.php

Occurs when the selected revision is the first or last of the list,
for both the left and right revs.

Fix Undefined array key "current" warnings

Multiple occurrences when showing a page's revisions.

Fixes #3392

Fix Undefined array key "ns" in search.php

Shown when expanding namespaces in Media Manager.

Fix undefined array key warning in auth.php

Got the following warnings on PHP 8.

- Undefined array key "DW<cookie_hash>" in .../inc/auth.php on line 248
- Trying to access array offset on value of

Fix undefined array key warning in auth.php

Got the following warnings on PHP 8.

- Undefined array key "DW<cookie_hash>" in .../inc/auth.php on line 248
- Trying to access array offset on value of type null in .../inc/auth.php on line 248

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Fix array access on null in Logger.php

Fixes #3391

fix: better max-width for images in tables

Tables are very aggressive with how they size the contents of their
cells. That leads to sometimes extremely small images with
max-width:100%, especially f

fix: better max-width for images in tables

Tables are very aggressive with how they size the contents of their
cells. That leads to sometimes extremely small images with
max-width:100%, especially for images that already have a small
intrinsic size.

Setting the max-width to 50vw, i.e. half the view-port, is chosen as a
trade-off between:
* letting small images keep their full size in most view-ports
* keeping large images still pretty large on large view-ports
* prevent scrolling in most circumstances (scrolling a table is really
bad user experience, this is the goal of the browser)

Fixes #2059

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Fix Undefined array key "fperm" warning

Also removed a few, now unnecessary `!empty` checks

Fixes #3382