Add Vietnamese localization

[bach3]

Description of Changes

I have added Vietnamese language support by adding the following files:

• packages/web/public/locales/translation/vi.yaml
• packages/web/public/locales/prompts/vi.yaml

Modified the following file:

• packages\web\src\i18n\config.ts

Checklist

• Modified relevant documentation
• Verified operation in local environment
• Executed npm run cdk:test and if there are snapshot differences, execute npm run cdk:test:update-snapshot to update snapshots

Related Issues

N/A

[kazuhitogo]

Thank you for your Pull Request.
When I tested it in my environment, the Vietnamese language setting was not applied.
After investigating the cause, it seems to be due to the multi-line text notation in the yaml file not being properly reflected, and forgetting to enclose the symbol parts in double quotes. Since I was able to make it work with the following modifications, would it be possible for you to make these changes?

And, Did you forgot translate?