lp1777677 Test Notification Permission & String change

lp1777677 Test Notification Permission & String change

- Update permission requirement to OPAC_LOGIN
- Update strings to be more end-user friendly

Signed-off-by: Kyle Huckins <khuckins@catalyte.io>
 Changes to be committed:
	modified:   Open-ILS/src/perlmods/lib/OpenILS/Application/Actor.pm
	modified:   Open-ILS/src/sql/Pg/950.data.seed-values.sql
	modified:   Open-ILS/src/sql/Pg/upgrade/XXXX.data.lp1777677-action-triggers-test-notification.sql
	modified:   Open-ILS/src/templates/opac/myopac/prefs.tt2
	modified:   Open-ILS/src/templates/opac/myopac/prefs_notify.tt2
	modified:   Open-ILS/src/templates/opac/myopac/test_notification.tt2