Fix #1398 "Import says validation import were canceled"

Regressed with 6dd86de2d2241c557c47b3c25c1597300b80502b.
Fix #1401 "Summary page shows "Search returned123of200documents.""

This is because whitespace between `xf:output` is removed. Arguably it should not be here, but we should use xxf:format-message() anyway, so did that and updated the resources.