Follow the following steps
1. open www.facebook.com
2. go to the bottom on the left side Facebook © YYYY
will be written.
3. Click on any thing appears just a little right of Facebook © YYYY
. this word means "language "
4. select English or double click English.
now this page will appear in english but the next pages after u login will not. for that follow the steps bellow.
4. Now login
5. Again go to the left bottom of the page
6. again click on what ever appears to a little right of Facebook © YYYY
7. Enjoy Facebook in English!
More visual info here :