switch registration text to an explanation of how login works

www/register/index.html

@@ -54,7 +54,7 @@
     <div id="align-container">
     <div id="main-container">
         <div id="data" class="hidden">
-            <p class="left" data-localization="main_p1"><!-- Zero Knowledge collaborative realtime editor. Protected from the NSA. --></p>
+            <p class="left" data-localization="register_explanation"><!-- Zero Knowledge collaborative realtime editor. Protected from the NSA. --></p>
         </div>
 
         <div id="userForm" class="form-group hidden">