On February 22, this Commons welcome greeting was forwarded:
*Please categorize our images !!!* You already have been asked by a bot to categorize your images. Therefore I don't understand why you keep on uploading images without categories. Uploading images without categorizing them doesn't make sense. Only categorized images can be found!
This was written (on July 4, 2010) in English by a German. In my opinion, we should let Germans write software but not welcome greetings, at least not in English. All of the worst cases I have seen on Commons have been rude English messages written by Germans.
This kind of mastering, "I shall teach you" tone is not uncommon on the German Wikipedia. When these Germans come to Commons, they bring the tone and just translate the words. The result can be disasterous. In the worst cases, it is magnified through a less then perfect mastering of English.
In this case, the same user continues to this day, with lots of '''boldface''' and exclamation marks:
http://commons.wikimedia.org/w/index.php?title=User_talk:Dezidor&diff=pr...
http://commons.wikimedia.org/w/index.php?title=User_talk:CostaPPPR&diff=...
http://commons.wikimedia.org/w/index.php?title=User_talk:Obenhausener&di...
Of course, most Germans are civilian. It's just that those who aren't, aren't corrected. Civility is treated just as any random personal property, like hair colour, and is not seen as an obligation.
Maybe Wikimedia Deutschland can organize a course in writing in a civil manner in English. That would be a real service to the community.