Some explanations for the major stunts which may help you to understand what is happening if you don't speak german:
"Rocco and his brothers" always use high visibilty vests to look like their actions are legal, but everything they do is completly illegal.
"Dixi kings train"
They needed to build that fake toilet because this entrance to the metro system is on the opposite of the public order office and because of that normaly impossible to use. Those toilets are called dixi toilets in Germany and are used by building sites.
They realised a theatre performance in a metro tunnel making most of the attending people believe it is an authorised performance. Bus travel to the tunnel entrance, red carpet, champagne, seats, stage, actors, everything perfectly "faked". The perfomance was about the dialouge of a graffiti sprayer in his twenties with himself in his thirties and featured tons of train bombing video material they shot in the last decade.
The whole stunt can be seen in the movie "blaues licht" which is available with english subs as well. So that's an old stunt but needed to be spoken about because of it's size.
The tower they are climbing is the town hall of a berlin district and they are taking the huge flag down and putting it up again upside down because berlin seems to be upside down nowadays compared to some time ago. Referring to gentrification and lots of questionable political decisions in the near past. Several attemps and some help were needed to get it done.
Hope that helps to enjoy the video even without translation. Maybe an english version will be available one day as well.