fix #11090: disable Cancel All button when not needed
fix some minor typos
fix issue with files that failed during scanning
Merge pull request #1276 from mtbc/trac-11090-cancel-all

fix #11090: disable Cancel All button when not needed
Allow the user to close the importer w/o cancelling.
Use the correct method to indicate re-upload.
Adjust message when error returned during folder scanning.
Fix retry All issue (see #11138)