conversation: change label to call for action

Change-Id: Ie7658956bf57602a8a386893ea810abca05d97db
diff --git a/ring-android/app/src/main/res/values/strings.xml b/ring-android/app/src/main/res/values/strings.xml
index 85674f6..8a6ffef 100644
--- a/ring-android/app/src/main/res/values/strings.xml
+++ b/ring-android/app/src/main/res/values/strings.xml
@@ -170,6 +170,7 @@
     <string name="conversation_action_copied_peer_number_clipboard">%1$s copied to clipboard</string>
     <string name="conversation_action_select_peer_number">Select a number</string>
     <string name="conversation_action_block_this">Block this contact</string>
+    <string name="conversation_action_go_to_call">Return to ongoing call</string>
 
     <!-- Contacts -->
     <string name="add_call_contact_number_to_contacts">Add %1$s ?</string>