missing sprint and doubled string

[Dan]

We have two same error msg in 2 version because of a dot.
Remove or add one and see also sprintf difference. IMO it's missing.

bp-attachments\bp-attachments-screens.php:**89** bp_core_add_message( sprintf( __( 'Attachment could not be edited', 'bp-attachments' ), 'error' ) );

bp-attachments\bp-attachments-screens.php:**99** bp_core_add_message( __( 'Attachment could not be edited.', 'bp-attachments' ), 'error' );

[imath]

good catch :)