* Pluralise the multi-session remove button and confirmation dialog
When several sessions are selected in Settings > Sessions, the bulk remove button and its confirmation dialog used the singular "Remove this device" string. The singular "this" misleadingly implied the current device would be removed. Use the existing count-aware settings|sessions|sign_out_n_sessions key, matching the other-sessions menu, so the label reads "Remove N sessions".
Fixes#33812
* Update device-management e2e test for the pluralised remove button
The multi-select remove button now reads "Remove N sessions" instead of "Remove this device", so update the Playwright assertion to match.
* Put "Cancel" before "Remove N sessions" in the bulk session action bar
In the "Other sessions" multi-select action bar, "Remove N sessions" was
rendered before "Cancel", which placed the destructive action on the left.
Swap the two buttons so "Cancel" is on the left and "Remove N sessions" on the
right, per review feedback on #33983.