Everytime Roselia has used a German word/everytime they've sung in German, a compilation brought to you by Yamabuki Bakery. Feel free to correct the translations (some of them were just taken from the wikia), and let me know if I missed anything!

Albums: 1st Album, "Anfang" (Beginning)

Lives basically all of them lmao : 1st Live, "Rosenlied" (Song of the Rose); 2nd Live, "Zeit" (Time); 3rd Live, "Ewigkeit" (Eternity), 4th/Mini Live, "Vier" (literally just Four...), 5th Live, "Hitze" (Heat) and the Mini Lives ''Wasser'' (Water) and Flamme (Flame).

Songs containing words in German: Guren no Yumiya (this is a cover though so there's no one to blame here really)

I... guess we could include the Weiß Schwarz thingies but BanG! Dream can't change its name jdmsk

Anyways, we get it Roselia, English and Japanese are too boring for you. (Honestly German sounds really cool but orz)