Fix Italian catalog terminology and add gettext to development image

[ProfNardi]

Summary

Improved the Italian translations in the comics/editorial context and enabled translation compilation in the development container.

Changes

• Added gettext to Dockerfile.dev, providing the msgfmt utility required by Django's compilemessages.

• Corrected Italian terminology:

  • Clarified collection actions and labels for updated issues.

• Updated the Italian and Portuguese catalog headers; Portuguese message translations remain unchanged.

Compatibility

• Preserved existing template message keys and placeholders.
• Did not modify HTML templates or generate .mo files.
• Left the existing template-based pluralization unchanged.

Suggestions

• Consider updating compose.yaml to automate the compilation of translation catalogs when starting the development container.

Validation

• Italian and Portuguese catalogs compiled successfully with gettext installed in the development container.
• git diff --check passed.
• Docker image rebuild was not tested.

[gemini-code-assist]

Code Review

This pull request adds the gettext package to the development Dockerfile and updates the Italian and Portuguese translation files (django.po). Specifically, it refines several Italian translation strings for better accuracy and updates the metadata headers for both locales. There are no review comments, so I have no feedback to provide.