Photo gallery: add the obsolete date for the main photos

[g123k]

Hi everyone!

For the 4 main photos, and when one is outdated, we don't know the date:

I will add this to the bottom sheet.

[g123k]

@teolemon Would something like that be okay? (bottom info + arrows at the end of actions)

Or option 2:

The date will also be displayed for up-to-date photos.

[teolemon]

I like the upper one little bit more, but no strong opinions