Wrong dialog for blocking of group

When blocking a group, a dialog with these writings appear:

You are about to block a contact. Are you sure you want to continue?

This contact will see you offline and you will not receive messages he will send you.

☐ _Do not ask me again

Proposed:

You are about to block a group. Are you sure you want to continue?

Contacts in this group will see you offline and you will not receive messages they will send you.

☐ _Do not ask me again

I think this English should be improved. Window titles are missing, too.