Missing proper language field

Bug report for Colab: http://colab.research.google.com/.

When I save a notebook in my local Jupyter Notebooks interface and explore the source, it has the following section:

"kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
}

On the other hand, when I download the .ipynb file from Colaboratory, this sections looks like this:

"kernelspec": { 
    "name": "python3", 
    "display_name": "Python 3" 
}

The problem with the latter is that many tools (such as notebook.js) rely on the language field to properly render the HTML which is needed for code highlighting etc.

For example, when I use nbpreview to preview my notebook saved from Colab,it will look like this:

<code class="lang-undefined" data-language="undefined">

Whereas, one saved from my local Jupyter Notebook will look like this:

<code class=" language-python" data-language="python">

[blois]

The fix for this should be live now.

[MSeal]

Thanks for taking a look!

Classic and nteract have 4.5 support now, with lab still having partial support (id’s save but get replaced on each save). I’ll poke on that issue to see if we can get that prioritized.