Don't escape link text title

[PVince81]

1. Setup customgroups app
2. Create custom group "test"
3. Create a user "user1"
4. Add user "user1" to custom group "test"
5. Login as "user1"
6. Check notification

Before this fix: the title was escaped and appeared with "
After this fix: no escaping, proper display

Since we're using jquery's text here it will already render as plain text and no escaping is needed.

[PVince81]

stable10: #111