Resolve "Define usefull fields/info in tables for servers, requests"

name: Feature
about: New features or wider changes, 

Closes #38

Description

Columns and information for the Servers and Requests templ

Changelog

• Fix a bug/typo in the image id for visio1
• Updated information displayed in requests and servers tables

How to test

• launch the backend and frontend
• create one or more requests
• check on the servers and requests page (when logged as superdsi)
• times should be correct

Misc

• The routes.py file is a bit messy. Quite some work needs to be done on the backend side to refactor the export of the DB results to the Web client (e.g., create web_export methods for the info to be returned in the web client and move to a specific class). To be done in another refactoring issue.