Feature/persian implementation

[BlankuApp]

Summary

Adds Persian/Farsi support to Podstr.

Changes

• Adds Persian as a translation target.
• Adds the Persian Chrome locale and translated UI messages.
• Adds RTL handling for the popup and subtitle display.
• Adds Persian subtitle language detection.
• Adds Persian translated subtitle credits.
• Adds Persian README documentation.
• Adds Persian filename mapping in the server CLI.

Testing

• Loaded the extension in Chrome using Developer mode.
• Tested Persian UI and RTL layout.
• Tested Persian subtitle translation on a real video.

The managed backend still needs production verification for the canonical target value Persian.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Normalize Persian CLI aliases to the canonical target

When server.py translate is invoked using the CLI's established short-code convention (-t fa; --help itself shows the lowercase default ru), this mapping only affects the output filename while the original target_lang remains fa. Consequently, upload_to_cache() and save_to_local_db() persist fa, whereas the extension and managed-backend flow use the canonical value Persian, splitting Persian cache/database records and causing canonical-language queries to miss CLI translations. Normalize accepted aliases such as fa and case variants before translation, cache-key construction, and persistence.

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[BlankuApp]

Fixed in the latest commit. Persian CLI aliases now normalize to the canonical Persian value before translation, cache-key construction, and persistence.