Bug 36091: Spelling: Use "card number" instead of cardnumber in text

Bug 36091: Spelling: Use "card number" instead of cardnumber in text

This patch replaces the term "cardnumber" with "card number" in labels
and text where the patron's library card number is referred to. Where
the database column is referenced "cardnumber" is kept.

A full test plan would be very time-consuming and I think examining the
patch should be verification enough for changes which are limited to
adding a space.

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Verified that the patch only changes "visible" text, and not
references to the database column.
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>