fix english translation for blocking vpn system setting

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

@@ -104,7 +104,7 @@
   <string name="always_on_vpn">Always-on VPN</string>
   <string name="do_not_show_again">Do not show again</string>
   <string name="always_on_vpn_user_message">To enable always-on VPN in Android VPN Settings click on the configure icon [img src] and turn the switch on.</string>
-  <string name="always_on_blocking_vpn_user_message">To protect your privacy optimally, you should also activate the option \"Allow connections only via VPN\".</string>
+  <string name="always_on_blocking_vpn_user_message">To protect your privacy optimally, you should also activate the option \"Block connections without VPN\".</string>
   <string name="donate_title">Donate</string>
   <string name="donate_default_message">Please donate today if you value secure communication that is easy for both the end-user and the service provider.</string>
   <string name="donate_message">LEAP depends on donations and grants. Please donate today if you value secure communication that is easy for both the end-user and the service provider.</string>