Extern Incoming call string.

Fixes #4196
// FREEBIE

res/values/strings.xml

@@ -57,6 +57,9 @@
     <!-- BlockedContactsActivity -->
     <string name="BlockedContactsActivity_blocked_contacts">Blocked contacts</string>
 
+    <!-- CallScreen -->
+    <string name="CallScreen_Incoming_call">Incoming call</string>
+
     <!-- ConfirmIdentityDialog -->
     <string name="ConfirmIdentityDialog_the_signature_on_this_key_exchange_is_different">The
         identifying key material for %1$s has changed. This could either mean that someone is trying to

src/org/thoughtcrime/redphone/ui/CallScreen.java

@@ -64,7 +64,7 @@ public class CallScreen extends FrameLayout {
   }
 
   public void setIncomingCall(Recipient personInfo) {
-    callCard.setCard(personInfo, "Incoming call");
+    callCard.setCard(personInfo, getContext().getString(R.string.CallScreen_Incoming_call));
     callControls.setIncomingCall();
   }