[Plugin: ovulation predictor

this is a simple plugin to calculate pregnancy

http://wordpress.org/extend/plugins/ovulation-predictor/

this is the site

http://embarazoybebes.net/calculadora-de-embarazo/

ok hit calculate …..and it shows the results

but the results are in english,…….. how do i change that to spanish?