Improve Vietnamese Localization

[abel3t]

Explain your changes

• Smooth Vietnamese: Updated Vietnamese translations for natural and accurate phrasing.
• OTP Consistency: Replaced occurrences of "Mã một lần" with "OTP" to align with common Vietnamese usage.
• Translation Updates: Added Vietnamese translations for "username" and additional validation messages to ensure a fully localized experience.

Checklist

• [x] I have read the “Pull requests” section in the contributing guidelines.
• [x] I agree to the terms within the code of conduct.

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