Remove emotional language and add Crowdin automation workflow

[Copilot]

Addresses review feedback to prepare the repository for alpha release by removing non-technical language and adding translation automation.

Changes

• Documentation cleanup: Removed emotional language ("love", emojis) from markdown files and workflow output, while preserving technical testing terminology

  • .github/CHECKLIST.md: Preserved "(happy)" column suffixes - "happy paths" is a technical testing term
  • .github/workflows/release.yml: Removed emojis from GitHub Actions summary
  • README.md: Changed "Made with ❤️ by" to "Developed by"

• Crowdin translation workflow: Added .github/workflows/crowdin-sync.yml with three action modes:

  • upload-sources: Push English files to Crowdin
  • download-translations: Pull translations (default, runs weekly)
  • sync-bidirectional: Both directions
  • Auto-creates PRs with translation updates
  • Documented in MAINTENANCE.md with detailed GitHub secrets setup instructions (Settings → Secrets and variables → Actions)
  • Documented in workflows/README.md

• Guidelines maintenance: Updated .junie/guidelines.md timestamp to 2025-12-29

All 9 GitHub Actions workflows have workflow_dispatch configured for manual execution.

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[Copilot]

Pull request overview

This PR prepares the InvoicePlane v2 repository for alpha release by removing emotional language from documentation and adding automated translation management through Crowdin.

Key Changes:

• Removed non-technical language (emojis, emotional phrases like "happy", "love") from markdown files and GitHub Actions workflow outputs
• Added automated Crowdin translation synchronization workflow with three action modes (upload, download, bidirectional sync) and weekly scheduled runs
• Updated documentation to describe the new Crowdin workflow in both MAINTENANCE.md and workflows/README.md

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Changed "Made with ❤️ by" to "Developed by" for professional tone
.junie/guidelines.md	Updated "Last Updated" timestamp to current date (2025-12-29)
.github/workflows/release.yml	Removed emoji decorations from GitHub Actions summary output
.github/workflows/crowdin-sync.yml	New workflow for automated translation sync with Crowdin, featuring scheduled runs and manual dispatch options
.github/workflows/README.md	Added documentation section describing the new Crowdin sync workflow, its triggers, and requirements
.github/THEMES.md	Changed "love" to "prefer" in Nord theme description for neutral language
.github/MAINTENANCE.md	Added comprehensive documentation for Crowdin translation sync workflow including setup and usage instructions
.github/CHECKLIST.md	Removed "(happy)" suffixes from test coverage table column headers

Review Summary: The changes successfully achieve the stated goals of removing emotional language while adding valuable automation infrastructure. The Crowdin workflow is well-structured with appropriate permissions, error handling, and documentation. All changes maintain consistency with the project's professional standards and are ready for alpha release.