Enhancement: Add info about the language in the talks list

[sq5bpf]

I propose an improvement to add info to the talk list about the presentation language , and the available translations. This would make picking talks to watch from a long list much easier (the language is not always easy to guess, for example in the below mockup the third talk is actually in German even if it has an English title).

In this mockup first talk is in English, second in English, but with a German translation (which is not true yet , but added it as an example), and the third in German.