Event Dashboard: Change "Apps" to "Website Generator" and other improvements

[mariobehling]

Currently the Android app is not functional. Therefore we should not feature it on the event dashboard. We can also enhance the area and the dashboard with a few smaller changes as follows:

• Change box heading "Event sponsors" to "Sponsors"
• Change box heading "Apps" to "Website Generator"
• Add the following text: You would like to have a dedicated event website with all details, sponsors listing, speakers and sessions and the entire schedule? Simply use the website generator. It transfers the data of the event via an API to our website tool and creates a website for you. You can download the entire site as a zip file and upload it to your own web hosting service. No database set up or framework required. This feature is still in Alpha stage, but is already used actively by a number of events. If you press the below button a tab will open where your website is generated.
• Below the text show a button "Create Website" (change the current button "Generate Web App"). Use a nice icon and use similar style to the download button for tickets.