docs: update environment requirements and modular i18n guide

[RohithPariki]

Description

This PR updates CONTRIBUTING.md to resolve documentation drift and guide new contributors accurately:

1. Environment Requirements & Local Setup:

   • Updated Node.js requirement to Node.js version 22+ (minimum >=22.22.0 as specified by root package.json).
   • Added pnpm version 11+ (corepack enable pnpm) as an explicit monorepo requirement.
   • Updated Python requirement to Python version 3.12+ (matching backend apps/api/Dockerfile.api).
   • Documented that setup.sh automatically installs dependencies via pnpm install, and added explicit guidance for manual setups to run pnpm install before pnpm dev.

2. Language Support & i18n Architecture (packages/i18n):

   • Replaced obsolete references to monolithic translations.json / core.json files with the actual 28 modular namespace files (e.g., common.json, auth.json, work-item.json, project.json defined in packages/i18n/src/constants/namespaces.ts).
   • Updated the step-by-step instructions for adding a new language (TLanguage, SUPPORTED_LANGUAGES, namespace directory setup).
   • Removed instructions to edit a non-existent private importLanguageFile method, explaining that namespaces are dynamically loaded at runtime by i18next-resources-to-backend in instance.ts.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Improvement (change that would cause existing functionality to not work as expected)
• Code refactoring
• Performance improvements
• Documentation update

Screenshots and Media (if applicable)

Test Scenarios

• Verified package.json engines (>=22.22.0) and package manager (pnpm@11.10.0).
• Verified apps/api/Dockerfile.api Python base image (python:3.12.10-alpine).
• Verified packages/i18n runtime loading via resourcesToBackend in packages/i18n/src/core/instance.ts and namespaces list in packages/i18n/src/constants/namespaces.ts.
• Verified markdown rendering and link paths.

References

Closes #9755

Summary by CodeRabbit

• Documentation
  • Updated contributor setup requirements to Node.js 22+, pnpm 11+ through Corepack, and Python 3.12+.
  • Clarified setup script behavior and Docker Compose startup instructions.
  • Revised translation guidance to use modular namespace files, English as the source language, and dynamic runtime loading.
  • Documented ICU message formatting through the internationalization tooling.
  • Improved examples and formatting in the contribution guide.

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📝 Walkthrough

Walkthrough

CONTRIBUTING.md now documents current environment requirements, local setup behavior, modular translation namespaces, and the updated workflow for adding translations and languages.

Changes

Contributor Guide Updates

Layer / File(s)	Summary
Environment and local setup requirements CONTRIBUTING.md	The guide now requires Node.js 22+, pnpm 11+, and Python 3.12+. It documents setup.sh and uses detached Docker Compose startup.
Modular translation contribution workflow CONTRIBUTING.md	The guide now describes namespace JSON files, i18next-icu, English as the translation source, and dynamic language resource imports.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 215b3

This documentation update aligns contributor setup and translation guidance without any identified merge-readiness risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR addresses all coding-related objectives in issue #9755, including Node.js, pnpm, Python, setup instructions, modular namespace files, new-language steps, and dynamic i18n loading.
Out of Scope Changes check	✅ Passed	The changes are limited to CONTRIBUTING.md documentation updates that support the linked issue. The setup.sh, Docker Compose, Markdown, and type-example clarifications are related documentation correc…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Title check	✅ Passed	The title clearly identifies the documentation update and covers both the environment requirements and modular i18n guide changes.
Description check	✅ Passed	The description follows the required template, explains the documentation changes, marks the documentation update type, lists test scenarios, and references issue #9755. Screenshots are not applicable…

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🟢 +0 new · 🟠 ~1 changed · 🔴 -0 removed · 0 flows · 1 file · commit 215b3a4

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🟡 CHANGED Contribution Guide

Developer onboarding documentation detailing setup prerequisites, environment bootstrap scripts, and translation workflows.

• CONTRIBUTING.md:37-222

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Actionable comments posted: 2

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Inline comments:
In `@CONTRIBUTING.md`:
- Line 123: Update the directory-tree code fence near the referenced
documentation section to include the text language tag, resolving markdownlint
MD040 without changing the fenced content.
- Line 201: Update the TLanguage type example to use a valid TypeScript union by
removing the trailing | ... and ending the union with "your-lang".

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