User is informed that registration can be long

On Windows, daemon can take some time to create an account and it
is even worse when a user want to register its name. A label is
now displayed to advise the user about that. Moreover, this label is
modified during the process to show which step is currently
running.

Change-Id: Ia32099f9f46f430293be9e0c03828ea12728e5ce
diff --git a/wizarddialog.ui b/wizarddialog.ui
index 05504b5..b11cf94 100644
--- a/wizarddialog.ui
+++ b/wizarddialog.ui
@@ -478,6 +478,18 @@
          </property>
         </widget>
        </item>
+       <item alignment="Qt::AlignHCenter">
+        <widget class="QLabel" name="progressLabel">
+         <property name="font">
+          <font>
+           <pointsize>11</pointsize>
+          </font>
+         </property>
+         <property name="text">
+          <string>Generating your Ring account...</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
     </widget>