Add Indonesian translations and language support

[bangden07]

What this changes

How I tested this

Checklist

• [✅] I have read CONTRIBUTING.md and this PR follows the guidelines
• [✅] A human has reviewed the entire diff of this PR, every line of code
• [✅] A human understands the changes and can explain why this approach is correct
• [✅] Tests pass (make full)
• [✅] This PR doesn't have AI-generated boilerplate or co-author lines
• [❌] This PR was authored and submitted by an AI agent without human review

[github-actions]

Worth a look

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[eljojo]

@bangden07 in order to get this PR reviewed, please address our contribution policy and fill out the required fields in the PR template

[eljojo]

@bangden07 hey, if you're a human who opened up this pull request please confirm. otherwise I'll close it.