diff --git a/electrum/gui/qml/components/controls/FeeMethodComboBox.qml b/electrum/gui/qml/components/controls/FeeMethodComboBox.qml
index 53ac4eaa2..56cbb829f 100644
--- a/electrum/gui/qml/components/controls/FeeMethodComboBox.qml
+++ b/electrum/gui/qml/components/controls/FeeMethodComboBox.qml
@@ -3,7 +3,7 @@ import QtQuick.Controls
 
 import org.electrum 1.0
 
-ComboBox {
+ElComboBox {
     id: control
 
     required property QtObject feeslider
diff --git a/electrum/gui/qml/qetxfinalizer.py b/electrum/gui/qml/qetxfinalizer.py
index e4d12ef6c..f409f09f6 100644
--- a/electrum/gui/qml/qetxfinalizer.py
+++ b/electrum/gui/qml/qetxfinalizer.py
@@ -442,11 +442,11 @@ class TxMonMixin(QtEventListener):
             self.txidChanged.emit()
 
     # override
-    def get_tx(self):
+    def get_tx(self) -> None:
         pass
 
     # override
-    def tx_verified(self):
+    def tx_verified(self) -> None:
         pass
 
 
diff --git a/electrum/gui/qt/network_dialog.py b/electrum/gui/qt/network_dialog.py
index 973f70bca..07a9fa308 100644
--- a/electrum/gui/qt/network_dialog.py
+++ b/electrum/gui/qt/network_dialog.py
@@ -447,7 +447,7 @@ class NetworkChoiceLayout(object):
             self.tor_cb.hide()
             return
         self.tor_proxy = found_proxy
-        self.tor_cb.setText("Use Tor proxy at port " + str(found_proxy[1]))
+        self.tor_cb.setText(_("Use Tor proxy at port {}").format(str(found_proxy[1])))
         if (self.proxy_cb.isChecked()
                 and self.proxy_mode.currentIndex() == self.proxy_mode.findText('SOCKS5')
                 and self.proxy_host.text() == "127.0.0.1"
@@ -608,7 +608,6 @@ class ServerWidget(QWidget, QtEventListener):
             self.set_server()
         self.nodes_list_widget.setServer.connect(do_set_server)
 
-
         self.layout().addWidget(self.nodes_list_widget)
         self.nodes_list_widget.update(network=self.network,
                                       servers=self.network.get_servers())