This new e-flight calculator has a choice (switch) between German and English language:
http://www.elektromodellflug.de
-> datenbank
-> antriebsrechner
Download the zipfile, run the spreadsheet and select your language using the buttons in the upperrighthand corner.
More info on the usage of the calculator:
http://www.badcock.net/motorcalc/
Example:
http://goldeneye.ethz.ch/motoren/electric/...hlight/index_EN
If you want to translate the other articles/items on said site, you can use e.g.
http://translate.google.com/translate_t