Sharepoint 2010 Upload Document page customization

The upload document page resides under the layouts directory with filename "Upload.aspx".

If you're on on-prem environment where you're allowed to do little customization:

• Create a copy of "Upload.aspx" and edit the html (Change text)
• Create a Custom Action for the ribbon to replace the out of the box Upload Document button with yours that would open your customized upload page
• Modify the functionality of (+) Add document link so that it opens your custom upload page.

An alternative and easy approach would be to modify the text using javascript/jQuery. You can add this snippet to your custom javascript file referenced in your master page. If languages other than English are being used, you need to modify the script accordingly.

function changeHeaderText() {
  if (document.URL.toLowerCase().indexOf('/upload.aspx') != -1) {
      // Check if header with text exist
      $("h3.ms-standardheader:contains('Destination Folder')").text("Project Folder");
  }
}

$(document).ready(function () {
    changeHeaderText();
});