feat(i18n): add Georgian translation

[lukkshh]

Summary

• Add Georgian (ka) translation
• Add Georgian to the available locales

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[vercel]

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[greptile-apps]

Greptile Summary

Adds Georgian localization support throughout the application.

• Adds a complete ka-GE translation catalog.
• Registers Georgian in the language selector with Georgian date formatting.

Confidence Score: 5/5

The pull request appears safe to merge with no actionable defects identified.

The Georgian catalog matches the canonical message structure and interpolation contracts, while its locale registration matches both the message-loading convention and the installed date-fns API.

Important Files Changed

Filename	Overview
public/intl/messages/ka-GE.json	Adds a Georgian catalog with complete canonical-key coverage and matching ICU placeholders.
src/lib/lang.ts	Registers ka-GE and maps it to the supported date-fns Georgian locale.

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