Final interpretation of and amendments to the German Constitution, the Grundgesetz, is the task of the Bundesverfassungsgericht (Federal Constitutional Court), which is the de facto highest German court, as it can declare both federal and state legislation ineffective, and has the power to overrule decisions of all other federal courts, despite not being a regular court of appeals on itself in the German court system. It is also the only court possessing the power and authority to outlaw political parties, if it is deemed that these parties have repeatedly violated articles of the Constitution.

Answer this question, if possible (if impossible, reply "unanswerable"): The english translation of this court and its duties is what?
Federal Constitutional Court