Fixed login progress text

app/css/app.css

@@ -767,9 +767,10 @@ a.tg_radio_on:hover i.icon-radio {
   font-size: 13px;
 }
 .login_form_messaging {
+  text-align: center;
   color: #959595;
   font-size: 13px;
-  margin-top: 10px;
+  margin-top: 20px;
 }
 
 .login_country_selector {

app/partials/login.html

@@ -24,7 +24,7 @@
       <span ng-switch-when="true">Generating keys<span my-loading-dots></span></span>
       <span ng-switch-default>Next</span>
     </button>
-    <div class="login_form_messaging" ng-show="progress.enabled">Key generation will only happen once, it could take several minutes on slower devices, please be patient.</div>
+    <div class="login_form_messaging" ng-show="progress.enabled">Keys are only generated once. This can take a few minutes on slower devices, please be patient.</div>
   </form>
 
   <form name="myLoginForm" ng-if="credentials.phone_code_hash &amp;&amp; !credentials.phone_code_valid" ng-submit="logIn()">