6843 UI does not respect the default language

[mfacar]

fixes #6843

PR checklist:

• [ ] Update READ.me ?
• [ ] Update API documentation ?

QA checklist:

• [ ] Smoke test the functionality described in the issue
• [ ] Test for side effects
• [ ] UI responsiveness
• [ ] Cross browser testing
• [ ] Code review

[sentry-io[bot]]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: app/react/entry-server.tsx

Function	Unhandled Issue
EntryServer	TypeError: The "regexp" argument must be an instance of RegExp. Received type number (0) ... Event Count: 2 Affected Users: 1
EntryServer	TypeError: Cannot read properties of undefined (reading 'route') GET /ab:0/^\/(... Event Count: 1 Affected Users: 1

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