Re-implement mixed provider (fix #145)

app/src/main/res/values-pt/strings.xml

@@ -21,6 +21,7 @@
     <string-array name="settings_provider_names">
         <item>Provedor GPS</item>
         <item>Provedor Rede</item>
+        <item>Provedor Misto</item>
     </string-array>
     <string name="settings_foreground_title">Serviço primeiro plano</string>
     <string name="settings_foreground_summary">Aumentar a prioridade de serviço</string>