My main fields of action in Ubuntu are:
 - German translations (l10n and i18n) and German translation bug management
 - Developing and coordinating standard translations across distributions
 - Communicating simple l10n and i18n issues to upstream
 - German Translation support: https://forum.ubuntuusers.de/forum/lokalisierung/
 - Wiki maintenance: https://wiki.ubuntu.com/UbuntuGermanTranslators/
 - General bug reporting