This PR implements a minimal Russian greeting functionality as requested in the issue. The change adds "привет" (hello) to the YDB embedded UI cluster overview section.

Changes Made

Internationalization (i18n) Updates

• Added src/containers/Cluster/i18n/ru.json - Complete Russian translation file for the Cluster component, including the new greeting
• Updated src/containers/Cluster/i18n/en.json - Added "Hello" greeting for consistency
• Updated src/containers/Cluster/i18n/index.ts - Modified to import both Russian and English translations

UI Implementation

• Updated src/containers/Cluster/ClusterOverview/ClusterOverview.tsx - Modified the overview title to display the greeting alongside the existing "Overview" text
• The greeting now appears as:
  • Russian: "Привет - Обзор"
  • English: "Hello - Overview"

Testing

• Added src/containers/Cluster/__test__/greeting.test.ts - Unit test to verify the greeting functionality works correctly

Technical Details

The implementation follows existing patterns in the codebase:

• Uses the established i18n system with @gravity-ui/i18n
• Maintains backward compatibility
• Supports language switching between English and Russian
• Minimal code changes with maximum reuse of existing infrastructure

Validation

• ✅ Build successful with no errors
• ✅ Linting passes (no new warnings introduced)
• ✅ Unit tests pass
• ✅ i18n system properly configured for both languages

Screenshot

Note: The screenshot shows the UI in a state where it displays a "Network Error" because no YDB backend is running. This is expected behavior. When connected to a YDB instance, the greeting will appear in the cluster overview section title.

The greeting functionality will be visible in the cluster overview section when the application is connected to a YDB cluster instance.

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