Improve "trash is full" error message
This error message was mis-formatted in several ways:
- Using an exclamation point
- An inappropriate line break (the UI that displays it should be responsible for ensuring a sane maximum width and/or text wrap as needed)
- The wrong formatting for a line break (\n instead of KUIT formatting)
- A grammatically incorrect word ("cleanup" used as a verb, when it is a noun).
This commit fixes those issues.
BUG: 442865 FIXED-IN: 5.87