Bug 15573: String and translatability fix to Patron Card Creator

Bug 15573: String and translatability fix to Patron Card Creator

Fixing the split string

To test:

1) Go to Tools -> Patron Card Creator -> Manage -> Card batches
2) Confirm the table heading reads 'Patron Count'
3) Edit a batch
4) Click Remove duplicates
5) Confirm it reads 'Duplicates removed from batch number X: Y patron(s)'

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as described. Rewording Ok for translatability purpose

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit a3d2de6248386d0efc91c317f2c2e84d936198f6)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>