kivy: remove context menus, cleanup unused files

electrum/gui/kivy/uix/dialogs/tx_dialog.py

@@ -98,6 +98,11 @@ Builder.load_string('''
                 height: '48dp'
                 icon: 'atlas://electrum/gui/kivy/theming/light/qrcode'
                 on_release: root.show_qr()
+            Button:
+                size_hint: 0.5, None
+                height: '48dp'
+                text: _('Label')
+                on_release: root.label_dialog()
             Button:
                 size_hint: 0.5, None
                 height: '48dp'
@@ -271,3 +276,14 @@ class TxDialog(Factory.Popup):
                 self.dismiss()
         d = Question(question, on_prompt)
         d.open()
+
+    def label_dialog(self):
+        from .label_dialog import LabelDialog
+        key = self.tx.txid()
+        text = self.app.wallet.get_label(key)
+        def callback(text):
+            self.app.wallet.set_label(key, text)
+            self.update()
+            self.app.history_screen.update()
+        d = LabelDialog(_('Enter Transaction Label'), text, callback)
+        d.open()