Translation of estrogen in Spanish

I learned Russian during 8 years in highschool, but since I left school 6 years ago, I have forgotten most of it and did not have opportunity to speak or practice in any way. That's why I am on Vocabulix.
I wanted to ask whether you would like to help in another English - Spanish project. The dictionary has around 10,000 -20,000 entries and many of them do not have sample sentences. We need to add sentences to give users more background.
I'm also not interested in such things, but I had a classmate who recommended the book 'Mice and Men' and that's why I bought it. It is a very interesting book and tells about old times in the U.S.