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<?php
// filter the Gravity Forms button type
add_filter("gform_submit_button_1", "form_submit_button", 10, 2);
function form_submit_button($button, $form){
return "<button class='button' id='gform_submit_button_{$form["id"]}'><span><i class='fa fa-share fa-2x'></i> Send </span></button>";
}
//Change hook of gform_submit_button_X to the form that you are using 
//Change <span><i class='fa fa-share fa-2x'></i> Send </span> to Font awesome and text of your choice