LPS-48101 Uses the right redirect url
LPS-48101 Copy from EditFileEntryAction (no logic changes)
LPS-48101 Copy from edit_file_entry.jsp (no logic changes)
LPS-48101 Not allow adds different mimeTypes when we are selecting a type
LPS-48101 Remove more unnecessary code
LPS-48101 Rename jsp to add because it only allows adding, not updating.
LPS-48101 Format source