The US has a statutory definition of currency manipulation; while some US economists don't quite agree with the legal definition, nevertheless the topic is fairly widely discussed in the US in technical terms (well among those who comprehend these things). For some US examples see a related question.
What I want to ask here is: what's the German or EU-level take on the topic of the technical definition of currency manipulation? This can arguably be a somewhat broad question, so I'd prefer a top-down approach: whether there are any official definitions used (e.g. in EU or government reports, especially in big countries like Germany) or just some views of well known European institutes or EU economists.