Hi Christian,
After looking at the Dutch language file, it seems it is not yet fully translated by the Dutch translation team(http://take.ms/fUu4w).
If that is the case, you can override your language file and include the necessary translations.
I have provided the language constants below that you can use to translate.

APP_USER_PAGES_STREAM_CREATED_TITLE_DASHBOARD="New page has been created, %1$s"

COM_EASYSOCIAL_EVENTS_TOTAL_ALBUMS_SINGULAR="%1$s Album"

COM_EASYSOCIAL_EVENTS_TOTAL_ALBUMS_PLURAL="%1$s Albums"

COM_EASYSOCIAL_EVENTS_TOTAL_VIEWS_SINGULAR="%1$s View"

COM_EASYSOCIAL_EVENTS_TOTAL_VIEWS_PLURAL="%1$s Views"

COM_EASYSOCIAL_EVENTS_TOTAL_MEMBERS_SINGULAR="%1$s Attendee"

COM_EASYSOCIAL_EVENTS_TOTAL_MEMBERS_PLURAL="%1$s Attendees"