[BUG] Missing translations in Quick Switch popup

**BUG**

The Ok/Cancel buttons in the Quick Switch modal are missing English translations:

<img width="429" height="146" alt="Image" src="https://github.com/user-attachments/assets/2290beed-60ac-4a12-9f71-1c9cc5feeb37" />

**Environment**

- Extension version: Header Editor 5.2.4 manifest v2
- Browser version: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143.0) Gecko/20100101 Firefox/143.0