docs: Translate failsafe article (en)

docs/en/SUMMARY.md

@@ -13,6 +13,7 @@
   * [RC setup](radio.md)
   * [Flight modes](modes.md)
   * [Power setup](power.md)
+  * [Failsafe configuration](failsafe.md)
 * Working with Raspberry Pi
   * [Raspberry Pi](raspberry.md)
   * [RPi Image](image.md)

docs/en/failsafe.md

@@ -0,0 +1,13 @@
+# Failsafe configuration
+
+Main article is available at https://docs.px4.io/master/en/config/safety.html.
+
+The *Safety* panel allows you to configure actions that should be performed when a failsafe is triggered. You should at the very least configure the RC Loss failsafe, which is triggered when the RC transmitter link is lost:
+
+1. Open the *Safety* panel.
+2. Select one of the following actions in the *RC Loss Failsafe Trigger* option:
+    * *Land mode* – transition to automatic land mode;
+    * *Terminate* – set all outputs to their failsafe values.
+3. Set the timeout value before RC Loss triggers in the *RC Loss Timeout* field. We recommend setting it to 0.5 s.
+
+<img src="../assets/qgc-failsafe.png" alt="QGroundControl failsafe" class="zoom">