Add Indonesian UI

[imnasnainaec]

Also remove unnecessary ../ added to image paths in non-English user guide pages. They are now automatically resolved by mkdocs.

Devin: https://app.devin.ai/review/sillsdev/TheCombine/pull/4319

This change is 

Summary by CodeRabbit

• New Features

  • Added Indonesian language support across the app and site.
  • Expanded the user guide with new Indonesian pages for account, project, data entry, and data cleanup workflows.

• Documentation

  • Updated multiple translated guides so screenshots load correctly in all supported languages.
  • Added a new Indonesian documentation index and admin guide.

• Bug Fixes

  • Fixed several translated messages so placeholder text displays consistently.

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📝 Walkthrough

Walkthrough

Adds Indonesian (id) localization: a new translation.json catalog, writingSystem entry, README badge update, and MkDocs i18n/search/alternate config. Adds five new Indonesian user guide pages (index, account, admin, dataEntry, goals, project). Updates image paths in existing es/zh user guide pages and fixes a placeholder whitespace typo across several locale files.

Changes

Indonesian UI localization enablement

Layer / File(s)	Summary
Writing system and translation catalog src/types/writingSystem.ts, public/locales/id/translation.json, README.md	Adds Bcp47Code.Id to uiWritingSystems, introduces the full Indonesian translation catalog, and updates the README localization badge.
Interpolation placeholder fix public/locales/ar/..., en/..., es/..., pt/..., zh/translation.json	Removes extra whitespace inside the {{ val2 }} placeholder in findAndReplaceError across five locale files.

Indonesian user guide pages and mkdocs configuration

Layer / File(s)	Summary
MkDocs Indonesian config docs/user_guide/mkdocs.yml	Adds id language navigation mapping, search language, and /id/ alternate entry.
Index and account pages docs/user_guide/docs/index.id.md, account.id.md	New Indonesian index page and account guide covering registration, login, and settings.
Admin page docs/user_guide/docs/admin.id.md	New Indonesian admin guide covering project management and banner configuration.
Data entry page docs/user_guide/docs/dataEntry.id.md	New Indonesian data entry guide covering entry creation and duplicate handling.
Goals page docs/user_guide/docs/goals.id.md	New Indonesian data cleanup guide covering review, merge, and spell-check features.
Project page docs/user_guide/docs/project.id.md	New Indonesian project guide covering settings, languages, users, and statistics.

Existing user guide image path updates (es/zh)

Layer / File(s)	Summary
Account/Admin/DataEntry image paths account.es.md, account.zh.md, admin.es.md, admin.zh.md, dataEntry.es.md, dataEntry.zh.md	Screenshot references changed from ../images/... to images/....
Goals/Project image paths goals.es.md, goals.zh.md, project.es.md, project.zh.md	Screenshot references updated to images/... with occasional {.center} formatting adjustments.

Estimated code review effort: 2 (Simple) | ~15 minutes

Suggested labels: 🟨Medium

Suggested reviewers: jasonleenaylor

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding Indonesian UI support.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch id2

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.96%. Comparing base (e2b613d) to head (7b0f782).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4319   +/-   ##
=======================================
  Coverage   75.96%   75.96%           
=======================================
  Files         305      305           
  Lines       11384    11384           
  Branches     1411     1411           
=======================================
  Hits         8648     8648           
  Misses       2332     2332           
  Partials      404      404           

Flag	Coverage Δ
backend	87.22% <ø> (ø)
frontend	66.88% <ø> (ø)

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@public/locales/id/translation.json`:
- Line 335: Fix the typo in the `deleteConfirm` translation string by correcting
the missing space in the Indonesian copy; update the value in the locale entry
so the prompt reads naturally. Locate the string via `deleteConfirm` in the
translation JSON and adjust only that text.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 061452eb-1c51-4be1-b16e-009426d51bb7

📥 Commits

Reviewing files that changed from the base of the PR and between e2b613d and 392e756.

📒 Files selected for processing (25)

• README.md
• docs/user_guide/docs/account.es.md
• docs/user_guide/docs/account.id.md
• docs/user_guide/docs/account.zh.md
• docs/user_guide/docs/admin.es.md
• docs/user_guide/docs/admin.id.md
• docs/user_guide/docs/admin.zh.md
• docs/user_guide/docs/dataEntry.es.md
• docs/user_guide/docs/dataEntry.id.md
• docs/user_guide/docs/dataEntry.zh.md
• docs/user_guide/docs/goals.es.md
• docs/user_guide/docs/goals.id.md
• docs/user_guide/docs/goals.zh.md
• docs/user_guide/docs/index.id.md
• docs/user_guide/docs/project.es.md
• docs/user_guide/docs/project.id.md
• docs/user_guide/docs/project.zh.md
• docs/user_guide/mkdocs.yml
• public/locales/ar/translation.json
• public/locales/en/translation.json
• public/locales/es/translation.json
• public/locales/id/translation.json
• public/locales/pt/translation.json
• public/locales/zh/translation.json
• src/types/writingSystem.ts