Label forbidden networks in network search result.
After searching network in "Mobile network" setting page, when
showing search result, forbidden networks are explicitly
labeled.

Bug: 64099422
Test: manual
Change-Id: I12b1d5bab92f920628d816a27a9b03e202f8b781
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 90bac98..90cbd74 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -387,6 +387,7 @@
     <string name="preferred_network_mode_title">Preferred network type</string>
     <string name="preferred_network_mode_summary">Change the network operating mode</string>
     <string name="preferred_network_mode_dialogtitle">Preferred network type</string>
+    <string name="forbidden_network">(forbidden)</string>
 
     <!-- The preferred network modes in Mobile network settings -->
     <string-array name="preferred_network_mode_choices">