For Umgangsform Leo has:
form - die Umgangsform
form of use - die Umgangsform
For (gute) Umgangsformen
it has (good) manners and etiquette.Siehe Wörterbuch: umgangsformen
Um|gangs|form, die : Art des Umgangs (1 a) mit anderen Menschen; Art, sich zu benehmen; Manier (2):...
© 2000 Dudenverlag
manner 2 (often manners) behaviour towards others • has a very pleasant manner. http://www.chambersharrap.co.uk/chambers/features/chref/chref.py/main?query=manner&title=21st
manner noun (BEHAVIOUR)
[S] the usual way in which you behave towards other people, or the way you behave on a particular occasion
She has a rather cold, unfriendly manner.
As soon as he realized that we weren't going to buy anything, his whole manner changed.
(Definition of manner noun (BEHAVIOUR) from the Cambridge Advanced Learner's Dictionary)