upload expiry column on volumes with lifetimes

NOTE:
**please use english, or include an english translation.** aside from that,
all of the below are optional, consider them as inspiration, delete and rewrite at will

**is your feature request related to a problem? Please describe.**
there is uploads with lifetimes. i can see the upload time, but not sure how that exactly works with markdown files created in copyparty (i didn't exactly upload it).

**Describe the idea / solution you'd like**
it would neat to have an expiry time column

**Describe any alternatives you've considered**
calculating based on the lifetime shown in up2k and the shown upload date manually? ok sure but i hate mathing when the computer could've (also what if lifetime config changes)

**Additional context**
add any other context or screenshots about the feature request here