How can I find out which languages GitHub thinks my project is written in?

Question

I can't seem to find any indication in the GitHub UI which languages it thinks my projects are in.

Also, is there a way to suggest a different set of languages for each project?

Answer 1

Click on the color bar in the screenshot below:

FYI: How does github figure out a project's language? (answer: using the linguist library)

Answer 2

To complete Franck Demoncourt's answer and answer the second question:

Also, is there a way to suggest a different set of languages for each project?

You can use Linguist overrides to change the language of a set of files. This will impact syntax highlighting as well as language statistics. For example, with a .gitattributes file you make sure Linguist recognizes all your .h files as C++:

*.h linguist-language=C++