Prevent the back end tool tips from exceeding the screen width (see #6639)
Improve the tree view error messages (see #6620)
Show a hint in the news archive menu if there are no items (see #5888)
Fix some broken back end icons (see #6214)
Correctly trim the SQL statements in the `Database` class (see #6623)
Add the "rem" unit where it was missing (see #6634)
Merge remote-tracking branch 'upstream/hotfix/3.2.4' into hotfix/3.2.4.
Do not create multiple stylect layers upon Ajax changes
Merge remote-tracking branch 'upstream/hotfix/3.2.4' into hotfix/3.2.4.