I use Ubuntu 12.04 with German UI. However, when I ask questions here or anywhere else on Stack Exchange, and I am adding screenshots, I would prefer having them in English.
Thus, my question is: How can I change the language of a certain application, let's say Rhythmbox, to display in English for creating screenshots.
Note: I don't want to change it permanently, and I would prefer NOT to change it for all applications. Also, I would prefer not having to log out for finishing that task. It should be on the fly.