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You can center the view on any language by adding "#language:<lang name>" to the URL. For example: https://fatiherikli.github.io/programming-language-network/#...

Or just <ctrl>-f Languagename.

Yes, but then good luck with finding C, J, K, B or similar :) BTW, I'm not sure, but I think all the single letter language names are taken already?

Still some single letter programming language name left according to this blog post: http://iron9light.wordpress.com/2009/12/16/single-letter-pro... . However the post is a little old, so it may have changed.