memeLab
As an user, I want to know ASAP that a marker is recognized, so I don't keep trying to make the app recognize it when it already did.
The time to load an object depends on aspects like connection speed and size of the object. Sometimes users think that the recognition of the markers isn't working because the app isn't showing anything.
I propose that as soon as a marker is recognized it shows a "loading" animation. It should be downloaded before the lazy load (#101).
This issue is considering that what was implemented on issue #258 is working properly.
What need to be done: Show a loading gif to the user while the download of all exhibit content isn't completed. How it will be executed: The download is implemented making requests to the database like it was an API. These requests use the await command in javascript. The idea is to load the gif in every exhibit page at the beginning. When the request is finished, there will be a command to remove the gif from the page, since the await command assures that every command after it are executed only if the request is done.
