Remove unused $txt['reminder_{subject,mail}']
Remove unused $txt['reminder_{subject,mail}']

Fixes #6129

Signed-off-by: Christopher 'm4z' Holm <38073e896c2d24ee83797bcfa758b496d851ce61@gmail.com>

StealthWombat/SMF2.1-more-forkery,StealthWombat/SMF2.1-more-forkery