Check and adopt the PageTitle API to make it great again after 9 LTS with the Core API

[josefglatz]

https://docs.typo3.org/typo3cms/extensions/core/Changelog/9.4/Feature-85678-AddAPIForTitleTags.html?highlight=pagetitle

Check if it is necessary to add a suffix to the page title

[josefglatz]

Sufix added with #371. All other stuff is managed within #371

Closing therefore