b/3340443 Update toast to say "Invitation sent" and "Update sent"
when there are guests involved in event creation or updates.

Change-Id: I0e75866303d85d07c7e23c024853986fa79b2a33
diff --git a/res/values/strings.xml b/res/values/strings.xml
index aa85f18..cd67b7e 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -178,6 +178,10 @@
     <string name="creating_event">"Event created"</string>
     <!-- Toast message displayed when an existing event is saved after being modified -->
     <string name="saving_event">"Event saved"</string>
+    <!-- Toast message displayed when a new event with guests is created -->
+    <string name="creating_event_with_guest">"Invitations sent"</string>
+    <!-- Toast message displayed when an existing event with guests is saved after being modified -->
+    <string name="saving_event_with_guest">"Updates sent"</string>
     <!-- Title of message displayed to indicate available calendars are being loaded when creating
          a new event -->
     <string name="loading_calendars_title">"Loading calendars"</string>