Original: Because of its relatively small size for a capital city, Bonn was sometimes referred to, jokingly, as the Bundeshauptstadt ohne nennenswertes Nachtleben (Federal capital without noteworthy night-life) or the 'Bundesdorf' (Federal Village).
Simplified: Because of its relatively small size for a capital city, Bonn was sometimes jokingly called the Bundesdorf (Federal Village).