Issue #3596088: owner-voice the write-grant checkbox title for consistency

On the item-by-item read ceremony (RequestApproveForm), the read-trust and write-trust upgrade checkboxes use an owner-voiced, first-person title ("Read my @kind items in the future without asking" / "Add or change my @kind items in the future without asking") and name the consumer only in the description. The middle write-grant box broke the pattern with "Let @consumer change the items I share above", naming the consumer in the title redundantly (its description already names it).

Change

The write-grant title becomes "Change the items I share above", matching the boxes either side; the consumer stays named in the description only. French translation updated to match.