docs: Add i18n documentation

[Akatenvictor]

I18nContext exists with en/es locales but no docs on adding languages.

Acceptance Criteria: Guide for adding new languages

[ritachukwuneye]

@ritachukwuneye has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, kindly assign this issue to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ritachukwuneye to this issue.

[Securify001]

@Securify001 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi. I am a web3 fullstack developer. Kindly assign this issue to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Securify001 to this issue.

[drips-wave]

Congratulations, @Securify001! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Securify001: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊