What this PR does

This PR introduces partial Italian language support for the Grafana OnCall plugin by implementing i18n (internationalization) in the frontend components. To achieve this, I used the react-i18next and i18next libraries, which streamline the translation process and allow easy future additions of other languages if required.

Which issue(s) this PR closes

Closes #5248

Implementation Details

This PR includes the initial setup for Italian translations, with integration into several components within the Grafana OnCall frontend. The following files have been updated to support i18n:

• grafana-plugin/src/components/CursorPagination/CursorPagination.tsx
• grafana-plugin/src/components/Tutorial/Tutorial.tsx
• grafana-plugin/src/containers/RemoteFilters/RemoteFilters.tsx
• grafana-plugin/src/pages/incident/Incident.helpers.tsx
• grafana-plugin/src/pages/incidents/Incidents.tsx
• grafana-plugin/src/pages/incidents/parts/SilenceSelect.tsx

These files now incorporate react-i18next hooks for language management, and relevant strings have been extracted and translated into Italian within the i18n configuration.

Checklist

• [] Unit, integration, and e2e tests updated

  • Added unit tests to confirm translation loading and handling of default/fallback languages.
  • Updated relevant integration tests to validate language switching in the UI.
  • No e2e tests were required specifically for this change.

• [] Documentation added (or pr:no public docs PR label added if not required)

• [] Release notes label added (see labels prefixed w/ release:). These labels dictate how your PR will show up in the autogenerated release notes.

Related Issue

[Issue #5248 - Add Italian language support for the Grafana OnCall plugin (i18n)]