Remove script tags when printing an article as PDF (see #5626)
Escape the single quotation mark in the simple modal title strings

Signed-off-by: xchs <github@gmx.net>
Fix a few minor spelling and typing errors

- Fix a few typos found in the source code files
- Various other amendments

Signed-off-by: xchs <github@gmx.net>
Escape the ampersand characters in the page layout DCA

Signed-off-by: xchs <github@gmx.net>
Add "PHPSESSID" to the `TL_NOINDEX_KEYS` list
Return the uploaded files in the upload widget (see #5631)
Correctly export the `pubDate` of calendar feeds (see #5641)
Merge branch 'hotfix/3.0.7' into develop

Conflicts:
	system/modules/core/library/Contao/Controller.php
Merge pull request #5653 from xchs/hotfix/escape-ampersands
Merge pull request #5648 from xchs/hotfix/string-char-escape
Merge pull request #5652 from xchs/hotfix/typos
Update mediaelement.js to version 2.11.3 (see #5643)
Adjust the path of the referer template to the new folder structure
Add the "incomplete installation" message (see #5646)