Add "wifi lost" disconnect message.

Handle "WIFI_LOST" disconnect message.

Test: Manual, unit
Merged-In: I2ca69f5ac8aaf70e998b2f69c413f378b1f25be6
Bug: 32571209
Change-Id: I2ca69f5ac8aaf70e998b2f69c413f378b1f25be6
diff --git a/res/values/strings.xml b/res/values/strings.xml
index f89ed64..fcf4d12 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -1368,6 +1368,12 @@
         Unable to connect, please insert a valid SIM card.
     </string>
 
+    <!-- Call failure reason displayed when an in-progress WIFI call fails due to a loss of WIFI
+         connectivity, or the WIFI signal has degraded to the point the call cannot continue. -->
+    <string name="callFailed_wifi_lost">
+        Wi-Fi connection lost.  Call ended.
+    </string>
+
     <!-- The title for the change voicemail PIN activity -->
     <string name="change_pin_title">Change Voicemail PIN</string>
     <!-- The label for the continue button in change voicemail PIN activity -->