Tabs Pro 8.4.0

• Updates Regular Labs library

Changed​

• Removes not-used language files after installation

Fixed​

• Fixes issue with incorrect prefix characters for comments in the language files
• J4 Fixes issue with content of tabs on narrow screens not always showing (due to css conflicts of some templates)

^ Changes installer to use a package manifest instead of a custom installer plugin
^ Updated some php code to use PHP 7.4 standards
^ Updates translations: tr-TR

# Fixes issue with errors on installation on some setups, causing the Regular Labs Library to not get installed
# Fixes issue with hidden="hidden" attribute not being removed from open tabs