settings: mark template as read-only when the VM is running

qubesmanager/settings.py

@@ -250,6 +250,7 @@ class VMSettingsWindow(Ui_SettingsDialog, QDialog):
                 self.template_name.insertItem(i, text)
                 i += 1
             self.template_name.setCurrentIndex(self.template_idx)
+            self.template_name.setEnabled(not self.vm.is_running())
         else:
             self.template_name.setEnabled(False)
             self.template_idx = -1

settingsdlg.ui

@@ -65,7 +65,7 @@
             <item row="1" column="0">
              <widget class="QLabel" name="label_2">
               <property name="text">
-               <string>Template:</string>
+               <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Template&lt;span style=&quot; color:#ff0000;&quot;&gt;*&lt;/span&gt;:&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
               </property>
               <property name="buddy">
                <cstring>template_name</cstring>