Bug 16560: Translatability: Issues with "The entered " in opac-memberentry.tt

Bug 16560: Translatability: Issues with "The entered " in opac-memberentry.tt

This patch fixes two splitted sentences to avoid translation issues:

The entered <a href="#borrower_cardnumber">card number</a> is the wrong length.
The entered <a href="#borrower_cardnumber">card number</a> is already in use.

To test:
Apply patch and verify that html in the 2 that are changed is correct and that
they are not splitted by a-tags.

Note: I could not figure out under which conditions this code displays in
      the OPAC self registration form.

Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>