Merge pull request #8 from babolivier/development

Button now has a specific id

README.md

     <textarea required="required" placeholder="Your message" id="form_text_textarea"></textarea>
 </div>
 <div id="form_subm">
-    <button type="submit" id="form_subm">Send the mail</button>
+    <button type="submit" id="form_subm_btn">Send the mail</button>
 </div>
 ```
 

front/form.js

     var button = document.createElement('button');
     
     button.setAttribute('type', 'submit');
-    button.setAttribute('id', id);
+    button.setAttribute('id', id + '_btn');
     
     button.innerHTML = text;