🌐 feat(i18n): add Estonian language

[NippleOfAnApe]

Summary

Added translation into Estonian

Changes

New file et.toml and changed tabi's website 'faq-languages' to list Estonian as supprted language.

Type of change

• Bug fix (fixes an issue without altering functionality)
• New feature (adds non-breaking functionality)
• Breaking change (alters existing functionality)
• UI/UX improvement (enhances user interface without altering functionality)
• Refactor (improves code quality without altering functionality)
• Documentation update
• Other (please describe below)

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[welpo]

Thank you! I've updated the Spanish and Catalan docs and will merge now :)