Translation of troublemaker in German

After reexamining the detailed construction of the architecture, Voca People came to the conclusion that the software in today's configuration is not capable to handle massive downloads during day time.
The image width is ideal on all pages except on the front page. The image width there is almost double. Why? The introduction text could be on the left side, cause that is where people start reading.
San Telmo and Bocca were two additional neighborhoods that we have visited and these were actually quite nice. We were warned by the staff of our hotel to be alert in these neighborhoods as there were many thieves.