Bug 38138: (bug 33398 follow-up) Don't display code for primary contact method

Bug 38138: (bug 33398 follow-up) Don't display code for primary contact method

We have several choices for "primary_contact_method", we don't want to
display the code but the label
phone => Primary phone
phonepro => Secondary phone
mobile => Other phone
email => Primary email
emailpro => Secondary email
fax => Fax

Bonus: it will make it translatable.

Test plan:
1. Edit a patron record to add a Main contact method
2. Place a hold for this patron
3. Check the item in
   --> Pop up says "Main contact method:" followed by the choice.

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>