Adding the updated timestamp metadata for zim archives

[FredoAF]

trafficstars

Now in the library, the description on the cards is extended to show the timestamp of when the zim archive was updated

[kelson42]

I don't think to we want this honestly.

[FredoAF]

I don't think to we want this honestly.

fair enough, I've found that end users do want this as we get lots of enquiries asking when the content packages were created

[kelson42]

@FredoAF Where are these enquiries?

[FredoAF]

@FredoAF Where are these enquiries? @kelson42 I host a kiwix instance. Maybe have a think about it and discuss with your team - my users find it very helpful.