Automatically generate target-space text field value from request URL

Currently when a user visits the Office Importer page, both target space & target page fields are empty. Since there are no visual clues indicating that these fields are mandatory, we need to either auto-generate values for these fields or add visual clues. Since target page name is dynamically generated from input file name, we need to generate the target space field depending on the place where officeimporter was invoked.