[Properties dialog] Improve some permissions-related strings

Summary:
BUG: 96714
FIXED-IN: 5.48

Improve some permissions-related strings to be clearer.

Test Plan:
File:

Folder:

Reviewers: Frameworks, VDG, Dolphin

Subscribers: abetts, kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D13552