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 Undefined array key "fperm" warning

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

Fixes #3382

translation update

rename namespace Media to File

This is a bit more generic and allows us to have additional File
abstractions in here later.

translation update

translation update

cleaner behaviour for data directory check

Show a properly translated message.

translation update

readded $jump mechanism, removed unused functions

fix use of $rev parameter

fix entity definition

reenable the option to display a relative namespace for media files

This is used when searching for media files

make use of the new media file classes

This just crudely replaces the calls to the old functions with usage of
the new classes. This however already works and makes (manual) testing
of these classes

make use of the new media file classes

This just crudely replaces the calls to the old functions with usage of
the new classes. This however already works and makes (manual) testing
of these classes easier.

Next steps: remove the old media_printfile and media_printfile_thumbs
methods and fix/drop/replace the tests depending on them. search_media
might be obsolete, too already.

For search results the display classes need to show full namespaces.
This needs to be fixed again. No idea about the jump mechanism, yet.

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first go a refactoring the media manager

For now this only adds code. This takes care of encapsulating media file
information and has some UI classes to display those files in the
fullscreen media m

first go a refactoring the media manager

For now this only adds code. This takes care of encapsulating media file
information and has some UI classes to display those files in the
fullscreen media manager and the popup.

The code is untested and not integrated to run, yet. Next step is to
replace the parts in the media manager to call this new code (and fix
any bugs).

I tried not to change much HTML yet. This can be done later. For now the
goal is to just make it run again.

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translation update

check media_* used in UI\MediaDiff

do not repeat successful security checks. fixes #3363

This avoids creating lots of 403 errors for properly secured data
directories. Only one successful check per browser session will be
executed.

lazy load images

This adds the loading="lazy" attribute to embedded images and the
thumbnails in the media manager. This instructs modern broswers to load
images on demand when they come into view.

lazy load images

This adds the loading="lazy" attribute to embedded images and the
thumbnails in the media manager. This instructs modern broswers to load
images on demand when they come into view. It can reduce used bandwith
and improve perceived speed.

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