According to the recent announcement of ProactiveEvents API in Alexa Dev blogs the notification events are available in all locales supported by Alexa. Although my skill (and configuration of test devices) only supports german language, event notifications are partly / mixed in english and german language. Example output of an AMAZON.WeatherAlert.Activated event:
Sie haben eine neue Benachrichtigung von Skill XX. There is a thunderstorm alert for your area. Provided by Skill XX.
So the notification starts with an german part (including a reference to the source name) and switches to an english spoken part (again including a reference to the source name).
Any ideas how to fix this issue? My request to notification api includes the required localizedAttributes.