Improve privacy policy (#1610)

Author: imsodin

app/src/main/play/listings/en-GB/full-description.txt

@@ -8,4 +8,4 @@ Forum: https://forum.syncthing.net/
 
 Issues: https://github.com/syncthing/syncthing-android/issues
 
-Privacy-policy: https://github.com/syncthing/syncthing-android/blob/main/privacy-policy.md
+Privacy-policy: https://syncthing.net/android-privacy-policy

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

@@ -556,7 +556,8 @@ Please report any problems you encounter via Github.</string>
 
     <!-- Menu item linking privacy policy -->
     <string name="privacy_title">Privacy Policy</string>
-    <string name="privacy_summary">Open the Syncthing-Android privacy policy</string>
+    <string name="privacy_summary">Open syncthing-android\'s privacy policy, which covers usage (if any) of personal data, e.g. location.</string>
+    <string name="privacy_policy_url" translatable="false">https://syncthing.net/android-privacy-policy</string>
 
     <!-- Title of the preference showing upstream version name -->
     <string name="syncthing_version_title">Syncthing Version</string>

app/src/main/res/xml/app_settings.xml

@@ -308,7 +308,7 @@
             android:summary="@string/privacy_summary">
             <intent
                 android:action="android.intent.action.VIEW"
-                android:data="https://github.com/syncthing/syncthing-android/blob/main/privacy-policy.md" />
+                android:data="@string/privacy_policy_url" />
         </Preference>
 
         <Preference