Bug 33191: AutoEmailPrimaryAddress options don't match labels in memberentry

Bug 33191: AutoEmailPrimaryAddress options don't match labels in memberentry

This patch changes the wording for the EmailFieldPrimary system
preference to make it clearer.

To test:
1. Go to Administration > Global system preferences
2. Search for EmailFieldPrimary
3. Read the sentence and choices, make sure it makes sense, grammar and
   spelling are correct
4. Optionally, try the different options, they should work as before

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>