I am using drupal 7 and entityform module and also using this : https://www.drupal.org/node/1679794 instruction to sending email after submitting form. the only problem I have is I want my email body to be translatable in different languages. I already translated form labels here :
admin/config/regional/translate/translate
I also should add my form is a custom form not user sign up form ! I already know that I can change email body of sign up email here : admin/config/regional/i18n/variable
using rules module and After saving a new entityform submission event was also useless. it's like the event is not equal to form submission event . happens nothing after form submission. I also thought it would be helpful if I just could add some varibles to drupal default variables ! but I don't know how .