Reported on Meta.SE.
This was mentioned in another answer I believe, but I would like to add some mock UX for an idea of how it can work and look.
I just added an arrow next to the language to make it look like a selector.

When clicking on the language, a dialogue would appear with possible selection. For example, a list similar to the following.
✓ auto
-------
c#
css
html
javascript
plaintext
python
Another idea would be to show a dialogue similar to the image's details dialogue. Although this can be annoying and would much prefer the option above.
