improve connectivity_low_power_mode in untranslated.xml

Co-authored-by: bjoern <r10s@b44t.com>

scripts/untranslated.xml

@@ -7,5 +7,5 @@
     <string name ="shortcut_share_btn">Click the share button</string>
     <string name ="shortcut_add_to_home_description">Select - Add to Home Screen - to add the app to your home screen.</string>
     <string name="connectivity_low_data_mode">Low Data Mode: background message fetching is disabled.</string>
-    <string name="connectivity_low_battery_mode">Low Power Mode: background message fetching is disabled.</string>
+    <string name="connectivity_low_power_mode">Disabled by system's \"Low Power Mode\"".</string>
 </resources>