[BUGFIX] The newRecordLinkAddTitle text is not understandable

Separate the create new record label and the foreign table title
with a colon.

Resolves: #17955
Releases: 6.2
Change-Id: I0869f53e1e5ba0b49ded81e1605494fc2b44fdb0
Reviewed-on: https://review.typo3.org/23509
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny