Delete thread : Yes and no should be reversed + default focus on No

[dheurtev]

Issue

• When I delete a thread, the box has no on the left and yes on the right.
• No button appears selected by default (no color difference), no change with tab.

Expected behavior

• Traditionnally, yes is on the left and no on the right.
• The default should be no and should have a color difference to show it is the default choice.
• We should be able to change the choice by clicking or with tab.

Details

• Version used: 26.45 Linux snap on Kubuntu 25