Bug 25936: (QA follow-up) Spelling and wording

Bug 25936: (QA follow-up) Spelling and wording

[1] NotifyPassowrdChange => NotifyPasswordChange
[2] Someone has changed your library user account password.
    Scary? Changed it myself. Reworded it a bit.
[3] is( $THE_notice->status, 'failed', "The notice was sent immediately");
    Note that THE_notice is imo horrible :) Wont touch it though.
    But I think we should reword 'sent' since it just failed.
    And we actually should mock sending mail here. Adding FIXME.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>