add new download notification strings

app/src/main/res/values/strings.xml

@@ -147,5 +147,6 @@
   <string name="version_update_apk_description">Downloading a new %s version</string>
   <string name="version_update_storage_access_required">Storage access is required to web update.</string>
   <string name="version_update_storage_permission_denied">Storage permission request was denied.</string>
-
+  <string name="version_update_download_title">A new %s version has been downloaded.</string>
+  <string name="version_update_download_description">Tap here to install the update.</string>
 </resources>