Talks, not articles, and it's a significant fraction (less than half, more than 10%, I'd guess). What doesn't help is that sometimes the title could be partiall

Talks, not articles, and it's a significant fraction (less than half, more than 10%, I'd guess). What doesn't help is that sometimes the title could be partially and completely in English even for talks that are in German (e.g. due to referencing technical terms or memes).