Adjust languages to align with userbase

[mrubens]

Important

This pull request updates the localization settings by removing support for certain languages and adding Vietnamese, including the addition of Vietnamese translation files.

• Localization Updates:
  • Removed support for ar, cs, hu, pt, and ru languages from .roomodes.
  • Added support for vi (Vietnamese) in .roomodes.
• Translation Files:
  • Added Vietnamese translation files: chat.json, mcp.json, prompts.json, settings.json in webview-ui/src/i18n/locales/vi/.
  • Removed translation files for ar, cs, hu, pt, and ru from webview-ui/src/i18n/locales/.
• Miscellaneous:
  • Updated customInstructions in .roomodes to reflect the new set of supported languages.

^{This description was created by for e91d49c. It will automatically update as commits are pushed.}

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Latest commit: e91d49c

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