[BUGFIX] Add space in lockedRecords messages for translated languages

The space between the time amount and time unit must be
added directly in the code, as it's not possible to add a leading
space character in a localized string on our translation server.

- use GeneralUtility::trimExplode() for localized label parameter
- add space directly in the code instead of the LLL string

Already translated strings must not be adopted.

Change-Id: Iefeb1a4ed202a4110535fe62d13ce8691a10a80d
Resolves: #84088
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/55948


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>