kivy: add status dialog

gui/kivy/main.kv

@@ -393,6 +393,7 @@ BoxLayout:
                     .format(app.status)
                 font_size: '22dp'
                 minimum_width: '1dp'
+                on_release: app.popup_dialog('status')
 
             ActionOverflow:
                 id: ao

gui/kivy/main_window.py

@@ -322,7 +322,6 @@ class ElectrumWindow(App):
         else:
             wallet.start_threads(self.network)
             self.load_wallet(wallet)
-
         self.on_resume()
 
     def create_wallet_dialog(self, l):

gui/kivy/uix/ui_screens/status.kv

@@ -0,0 +1,25 @@
+Popup:
+    title: "Balance"
+    confirmed: 0
+    unconfirmed: 0
+    unmatured: 0
+    on_parent:
+        self.confirmed, self.unconfirmed, self.x = app.wallet.get_balance()
+    BoxLayout:
+        orientation: 'vertical'
+        spacing: '1dp'
+        GridLayout:
+            cols:2
+            Label:
+                text: _("Confirmed:")
+            Label: 
+                text: app.format_amount_and_units(root.confirmed)
+            Label:
+                text: _("Unconfirmed:")
+            Label:
+                text: app.format_amount_and_units(root.unconfirmed)
+            Label:
+                text: "Unmatured:"
+            Label:
+                text: app.format_amount_and_units(root.unmatured)
+        Widget