Add translations

[tharun571]

Changes made

• Translation System Integration: Added @jupyterlab/translation dependency and integrated ITranslator into all plugins
• French Translations: Created comprehensive French translation file (locale/fr.json) with 75 translations covering:
  • Settings panel labels and descriptions
  • Chat interface messages and commands
  • Error messages and notifications
  • Provider instructions and tooltips
  • Button labels and form elements
• Build Process: Added build script to properly include locale files in the extension package
• Source Code Updates: Updated all components to use trans.__() for user-facing strings

Issue: While the translation system is fully implemented, French translations are not appearing when JupyterLab language is set to French.

Fixes #12

[brichet]

Thanks @tharun571 for working on this.

I don't really know how work the translation in jupyterlab and extensions, but I wonder if we should not use the official language-packs for a better integration in the long run.

[brichet]

Some relevant documentation https://jupyterlab.readthedocs.io/en/latest/extension/internationalization.html

[jtpio]

I don't really know how work the translation in jupyterlab and extensions, but I wonder if we should not use the official language-packs for a better integration in the long run.

Yes usually we don't need to embed the locales, since they are managed separately with other packages. There is a process to add new extensions here: https://github.com/jupyterlab/language-packs?tab=readme-ov-file#adding-a-new-extension

So we would likely need to open a PR on this repo to add jupyterlite-ai.

[jtpio]

In the meantime, we can still move forward with this PR and use the translator for user facing strings, even if the translations are not ready yet.

[tharun571]

@jtpio shall I add jupyter lite ai there and make translations work in the expected way?