If you change the button text of "return to previous", the button will no longer work since the button text is submitted to see what button was pressed. An example of a solution is to change the <submit> html element to a <button type="submit" html element where the value submitted can be different than the text shown on the screen.
Note, as a workaround, you could try doing this in jquery until a proper solution is in place:
var edocliteForm = document.getElementById('edoclite');
//for some reason, letting this happen onsubmit submits the form anyway...
//get the button
var submitButton = $("input[name=userAction][value='return to previous']");
//add the button we want, after it (one line, don't let it wrap)
submitButton.after('<button type="submit" name="userAction" value="return to previous" onclick="return submitReturnToPrevious()" style="font-family: Verdana,Arial,Helvetica,sans-serif; font-size:100%; padding:1px 3px;">apply</button>');
//remove the original button