Download diploma thesis and attachments

[mkhumml]

As a teacher I want to download diploma theses and attachments so that I can transfer them to my hard disk.

Acceptance criterias:

• To download a diploma thesis you need a download button while editing existing files as well as besides the title while searching.
• If pressing the button fails (e.g. no files) there should be an error message.
• After clicking the download button successfully you should be able to select which files you want to download.
  • To select the files you should be able to set marks beside the file names
  • There should be a select all marker
  • If the select all marker is toggled it should unselect all
• There should be a "submit" and a "cancel" button
  • If the "submit" or "cancel" button is pressed successfully there should be a success message shown to the user
  • If the "submit" or "cancel" button is pressed unsuccessfully there should be a error message shown to the user
• After submitting the download there should be a "cancel" button for the existing download
• If the download is successfully it should be logged (user, date, diploma data (tbd))

[sebastian15038]

Finished