The remaining failure on Appveyor appears to be an unrelated problem with installing nbconvert from conda-forge.

To test: set zh-CN to the most preferred language in browser preferences, then launch the notebook with the LANG environment variable set, i.e. LANG=zh_CN jupyter notebook.

Just tested, it does work. Thanks :-)

Note : there is no fallback within a same lang (maybe this is normal behavior) : if I set browser lang tozh, it will never load thezh-CN translation.

Yeah, I think we should probably renamezh_CN to justzh, and introduce an automatic fallback when loading so that if you specifyzh_CN, it will usezh as well. But I think those can be in future PRs: I just wanted to get the translations working first.

Great work,@takluyver!! I tried testing and I'm seeing the translations that depend on the browser's language (working in both Chrome and Firefox) but I'm not seeing the translations that depend on the environment variables. I'm usingLANG=zh_CN jupyter notebook to run the notebook server... 🤔

I'm not sure what's going on there - maybe there are other environment variables besides LANG that affect it? I'm inclined to get this merged and keep iterating.

Ok let's do it 👍

Hi@takluyver, the translation doesn't work in the release version. I noticed that.mo andnbjs.json files are gitignored and there's no corresponding compiling process in the setup.py?

I had to manually follow the README and compiled my own version of end files to make the translation work. Perhaps we should keep .mo and nbjs.json files?

There's an issue for someone to integrate the steps to build the translations:#3102