updated Vietnamese translation

[jennyberry]

Summary

Brief explanation of the proposed changes.

Basic example

Include a basic example, screenshots, or links.

Motivation

Why are we doing this? What use cases does it support? What is the expected outcome?

Checks

• [ ] Read Create a Pull Request
• [ ] Supports all screen sizes (if relevant)
• [ ] Supports both light and dark mode (if relevant)
• [ ] Passes npm run test