5.1.1v1 for Joomla! 5.1.1

A short general information on the naming of files:

New German Joomla! Installations:

Joomla_0.0.0-Stable-Full_Package_German.[zip|tar.gz|tar.bz2]

Add German Language to existing Joomla! Installations:

de-[AT|CH|DE|LI|LU]_joomla_lang_full_0.0.0v[1|2|...].zip

What's Changed

• [4.4] Postinstallation-Message htaccess.txt brotli change by @tecpromotion in #3152
• [5.x] String sentence by @tecpromotion in #3169
• [5] correct forum link by @tecpromotion in #3186
• [5.1] Light/Dark Mode switch by @tecpromotion in #3185
• [4.x] MFA Backup Codes [a11y] [UI] by @tecpromotion in #3189
• [5.1] com_redirect - inline help for Activate Advanced Mode button #3192 by @zero-24 in #3193
• [5.1] Catch block for generic TUF exceptions #3191 by @zero-24 in #3194
• [5.1] Fix missing entries in help index by @tecpromotion in #3187

Full Changelog: 5.1.0v1...5.1.1v1
Milestone 5.1.1v1: https://github.com/joomlagerman/joomla/milestone/138?closed=1