Wetter Berlin, unlike weather Berlin, does not result in the weather widget being displayed. I realize the interface localization isn't a priority and I don't mind, but searching for the weather using the english word is a bit unnatural for a non-english speaker.
Both Google and DDG support this.
This probably goes without saying, but if you'd consider implementing this at some point, don't forget about all the languages with diacritics and all the users in hurry who can't be bothered to type the right letters at all times. (:
The widget is a great addition regardless, thank you!