general: Add missing mnemonics
Add mnemonics to several items.
Other changes
- region: Fix mnemonics from the "Login Screen" section
-
screen-page: Use header capitalization for the "Forbid New USB Devices" row!1976 (merged) - screen-page: Fix mnemonic of the "Lock Screen Notifications" row
See commit descriptions for more details.
Partially fixes #2541 (closed)
Edited by Automeris naranja