Fix issues from teams:i18n:translation-check in localizations

Translation update in Korean

Translation update in Korean

Fix grammar in proxy_except description

Remove trailing preposition.

Fix grammar for allowdebug description

Add a full stop between sentences for the allowdebug description.

Fix grammar for the hidepages description

de/de-informal/en: Removed redundant suffixes in TOC of configuration
manager / Synchronize terms in de and de-informal

de/de-informal updates: Replace "Nutzer" with more common word "Benutzer"
/ fix several typos / Fixes FS#2821

Brazilian Portuguese language update

de/de-informal: localization updates (delete user function)

FS#2751 - self deletion of user account

Remove search_references() and the refshow configuration option

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the medi

Remove search_references() and the refshow configuration option

The refshow configuration option wasn't used as described anymore
already in the latest release and after the introduction of the media
usage index the parameter is also no longer relevant for internal
optimization. The only place where it was still used is the no longer
used search_references()-function which is removed here, too.

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Hungarian language update

Korean language update

Informal German language update

Swedish language update

Korean language update

Japanese language update

Czech language update

Russian language update

de/de-informal: Change "Vorlage" to "Template"

de/de-informal: Re-add TOC suffixes (Will be removed after the release
again)

de/de-informal: Re-apply the updates of ba09710ad34bb383ae3526e84490a3d545f78866

Revert "German language update"

This reverts commit ba09710ad34bb383ae3526e84490a3d545f78866.

Conflicts:
lib/plugins/authad/lang/de/settings.php

Finnish language update