Add PHP ext intl as suggested dependency
This is a preparation for a lot of stuff with localization.
[TASK] Suggest PHP "intl" extension
This is the basis for further improvements, which require
locale aware operations.
Reviewed-by: Mathias Brodala <email@example.com>
Reviewed-by: Benni Mack <firstname.lastname@example.org>
Reviewed-by: Wouter Wolters <email@example.com>
Tested-by: TYPO3com <firstname.lastname@example.org>
Reviewed-by: Andreas Wolf <email@example.com>
Tested-by: Andreas Wolf <firstname.lastname@example.org>
Tested-by: Benni Mack <email@example.com>