Update some help texts
Update some help texts

Add note about different languages for the GDPR website.
Reword helptexts about GDPR.
Add missing rel="noopener"

Fixes #6419

Signed-off-by: 01e908796ff33b2313d28eb51e927f3fdf828dbd@gmail.com

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