'Install' button on AdGuard Browser Extension overview page leads to undefined page when using Brave browser

### Please answer the following questions for yourself before submitting an issue

- [X] Filters were updated before reproducing an issue
- [X] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [X] I checked to make sure that this issue has not already been filed

### AdGuard Extension version

4.4

### Browser version

Brave 1.69.162

### OS version

Windows 11

### Ad Blocking

_No response_

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

_No response_

### Language-specific

_No response_

### What Tracking protection options do you have enabled?

_No response_

### Issue Details

Steps to reproduce:
1. Go to https://adguard.com/de/adguard-browser-extension/overview.html
2. Click on "Installieren
3. It forwards to https://adguard.com/de/adguard-browser-extension/undefined

### Expected Behavior

It is should open https://chromewebstore.google.com/detail/adguard-werbeblocker-beta/gfggjaccafhcbfogfkogggoepomehbjl or https://chromewebstore.google.com/detail/adguard-werbeblocker/bgnkhhnnamicmpeenaelnjfhikgbkllg

### Actual Behavior

It throws 404 error

### Screenshots


### Additional Information

It is not German language specific. It is broken on English too