ui: change button labels on creation wizard

Change the text of new Ring account and existing Ring account buttons,
to a more comprehensible text

Change-Id: Ibd3242094b0e17f1db48a605738308aafd7d72fd

wizarddialog.ui

@@ -74,7 +74,7 @@
         </spacer>
        </item>
        <item>
-        <widget class="QPushButton" name="existingPushButton">
+        <widget class="QPushButton" name="newAccountButton">
          <property name="minimumSize">
           <size>
            <width>85</width>
@@ -82,12 +82,12 @@
           </size>
          </property>
          <property name="text">
-          <string>Existing Ring Account</string>
+          <string>Create Ring account</string>
          </property>
         </widget>
        </item>
        <item>
-        <widget class="QPushButton" name="newAccountButton">
+        <widget class="QPushButton" name="existingPushButton">
          <property name="minimumSize">
           <size>
            <width>85</width>
@@ -95,7 +95,7 @@
           </size>
          </property>
          <property name="text">
-          <string>New Ring Account</string>
+          <string>Link this device to an existing account</string>
          </property>
         </widget>
        </item>