Error when internationalizing documentation using sphinx and nbsphinx

[iamdalio]

Describe the bug

When attempting to internationalize Sphinx documentation that contains ipynb files using the make -e SPHINXOPTS="-D language='de'" html command, the following error occurs:

  docs/ecosystem/aim_tracking.ipynb:7: ERROR: Unexpected indentation.

How to Reproduce

1. clone doc files
   git clone https://github.com/hwchase17/langchain.git
2. cd langchain/docs
3. Add configurations to conf.py.
   locale_dirs = ['locale/'] # path is example but recommended.
4. make gettext
5. sphinx-intl update -p _build/gettext -l de
6. Translate po files. **Notice: modify msgstr in ipynb files **

#: ../../ecosystem/aim_tracking.ipynb:10002
msgid "Aim"
msgstr "Aim dasd 11"

7. make -e SPHINXOPTS="-D language='de'" html

Environment Information

Platform:              darwin; (macOS-13.1-x86_64-i386-64bit)
Python version:        3.10.8 (main, Oct 13 2022, 10:17:43) [Clang 14.0.0 (clang-1400.0.29.102)])
Python implementation: CPython
Sphinx version:        6.2.1
Docutils version:      0.19
Jinja2 version:        3.1.2
Pygments version:      2.14.0

Sphinx extensions

extensions = [
    "sphinx.ext.autodoc",
    "sphinx.ext.autodoc.typehints",
    "sphinx.ext.autosummary",
    "sphinx.ext.napoleon",
    "sphinx.ext.viewcode",
    "sphinxcontrib.autodoc_pydantic",
    "nbsphinx",
    "sphinx_copybutton",
    "sphinx_panels",
    "IPython.sphinxext.ipython_console_highlighting",
]

[mgeier]

Thanks for reporting this!

I have never used Sphinx internationalization myself, but I remember an issue a few years ago (#154) which seems to have been solved with #156. After that, I haven't heard about any problems, but maybe nobody has used it since then?

Anyway, I tried to reproduce, but the dependencies of the example project made it too cumbersome for me.

Can you please provide a minimal reproducible example?

[iamdalio]

@mgeier
Thanks for your response. I did some debugging and it seems that there is an issue with the internationalization logic in Sphinx. The MD and RST files are ok , but processing the internationalization logic for the IPYNB files which are in JSON format generates error.I will contact the Sphinx team and let them know.
nbsphinx is a great project, thank you.

[mgeier]

I don't think we should bother the Sphinx team at this point, I have the feeling that we can solve this on the nbsphinx side.

If you help me reproduce the problem, I can try to find the root cause and hopefully fix it.