Information on seminars and language courses at German universities is provided by the German Academic Exchange Service (DAAD).
You can obtain further information on German courses (worldwide) from the Goethe-Institut (www.goethe.de/en) and its more than 100 offices abroad.
Are you are interested in a language stay in Germany? You can find courses offered by the members of the Fachverband Deutscher Sprachschulen und Sprachreise-Veranstalter e.V. (FDSV) in the database https://fdsv.de/en/startseite-en/. All courses are in accordance with the European quality standard EN14804.