task/224 give more complete information with de Info buttons.

[NicolasVial]

This PR :

• Now have more complete info texts about general infos + possible actions.
• i also fixed a bug in this PR because I did in 1 line of code (it's a dirty hack but I didn't find a way to do smth better). The bug was that the app crash if we long click on a picture in ImageSetFragment and then go back with the back arrow.
• un-ignore a test that is now fixed :)