Media entry - show smaller preview about madek

[nadjaweisskopf]

• technical possible
• is a hack
• for users with more rights this would be a negative dev.
• exporting the pic is still possible
• during filehandling project the business logic and priveleges can be discussed and changed

[nadjaweisskopf]

was explicitely wished - pivotal ticket nr. https://www.pivotaltracker.com/story/show/44382973
next smaller version does not have the same quality.
need to talk to susanne - after all we want to wait until filehandling

[nadjaweisskopf]

According to Mischa we can leave the size as it is until we finish with the filehandling.