Replace hardcoded message by localized string

Fixes #4507

user manager: explicitly set CSV parameters

This is needed since PHP 8.4

replace deprecated utf8_encode #4354

use $auth instanceof AuthPlugin instead of not null check

Rector to rename print to echo calls

code style: ptln removed, useradmin cleanup

coding style: control flow line breaks

coding style: control flow whitespaces

update some plugin classes in phpdocs, reformatting

recover comments in list

codestyle adjustments: function declaration braces/spaces

Apply rector renames

Apply remaining rector fixes to lib

Apply rector fixes to the rest of lib/plugin

replaced deprecated utf8 functions

For now this uses full qualified namespaces, sensible imports may come
later.

Merge branch 'master' into psr2

add event to check access to admin plugins

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default im

add event to check access to admin plugins

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default implementation is the same as before, relying only on the
forAdminOnly() method and the users' isadmin or ismanager status.

Admin plugins themselves can override the method to do additional
checks. In this patch, I added that to the usermanager plugin which will
only return true if the current auth backend can list users.

However the real idea behind this change is that the new method emits a
new event called ADMINPLUGIN_ACCESS_CHECK which would allow plugins to
overwrite it. This way it could be possible to give certain user groups
access to certain admin plugins without giving them admin or manager
permissions.

Note: this does not change how the "Admin" link is shown, it still
depends on ismanager or isadmin. A plugin as mentioned above would need
to influence the display via the MENU_ITEMS_ASSEMBLY event.

Note: this only covers the basic access check. Admin plugins may need
further adjustments for access to other parts of the plugin (like AJAX
components). An additional commit will update this for the bundled
plugins.

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PSR-2 for usermanager plugin

line lengths shortened

This makes sure all files use line lenghts shorter than 120 characters.

This is a quick fix. It might not always be the nicest change.

remove DOKU_INC checks

There is no need for this check, since these files should not have any
main code that is executed on direct call.

Fixes PSR1.Files.SideEffects.FoundWithSymbols

removed implementation of _getcsv() in usermanager

Our minimum PHP version requirement is now over 5.3, so this workaround is
not needed anymore. See also c9454ee3a82b29418a7ee59f0bb35006ea6a7fb1

add required attributes in user manager #1388

Show specific error messages if user creation fails

* Fixed identified issue with button spans by replacing missing closing span tag as identified by selfthinker, removed in ae61441.

* Changed the flow of the navigation button HTML so the navigation buttons actually flow to the right.