Incompatible with mkdocs-jupyter plugin

[babushkai]

Trying with mkdocs-jupyter plugin(https://github.com/danielfrg/mkdocs-jupyter), using Jupyter notebooks (.ipynb) or Python scripts (.py) as pages in the mkdocs.yml are simply downloaded instead of being natively integrated.

The below screenshot is what can be seen via mkdocs serve. Once translated by mkdocs build, the above behavior occurs.

Looks default_language page handles this integration while others(my case, Japanese) one fails