I am developing a multilingual website that supports multiple languages and region-specific content.

I want to verify that:

- The correct language is displayed based on the selected locale.

- Date, time, currency, and number formats are correct.

- Text expansion does not break the UI.

- RTL languages (such as Arabic) render correctly.

- Translations are complete and no keys are missing.

What tools or techniques do you use to automate or manually verify localization during development?

I have already tried:

- Browser language switching

- Chrome DevTools locale override

However, I am looking for a reliable workflow that can be used during development and QA.

Any recommendations or best practices would be appreciated.