data transfer: implement persistence

Change-Id: Ib57b4ed8aec372b14dea55f30a1e936b05392c8f
diff --git a/ring-android/app/src/main/res/values/strings.xml b/ring-android/app/src/main/res/values/strings.xml
index 52731f6..2d0def1 100644
--- a/ring-android/app/src/main/res/values/strings.xml
+++ b/ring-android/app/src/main/res/values/strings.xml
@@ -107,8 +107,10 @@
     <string name="notif_channel_requests">Requests</string>
     <string name="notif_channel_file_transfer">File transfer</string>
     <string name="notif_mark_as_read">Mark as read</string>
-    <string name="notif_incoming_file_transfer_title">Incoming file transfer</string>
+    <string name="notif_incoming_file_transfer_title">Incoming file from %1$s</string>
     <string name="notif_incoming_file_transfer">Someone wants to send you a file</string>
+    <string name="notif_outgoing_file_transfer_title">Sending file to %1$s</string>
+    <string name="notif_outgoing_file_transfer">Someone wants to send you a file</string>
     <string name="action_open">Open</string>
 
     <!-- Call Fragment -->