Plentywiki: feature updates / report problems

[Mervi]

I'm going to keep logging changes here because I've found it really helpful for myself to be able to come back and check where I've made changes!

I've been working on the dreaded legal stuff a bit. Last year, I started to categorise images and add licensing information to them, but there are still quite a few where I haven't been able to find enough information to correctly attribute them to anyone. In the last few days I've added more license options, namely the Creative Commons licenses which would mostly be used by anyone wanting to upload their own art to the wiki. I've also been trying to make the text in the licenses and in the footer of the wiki etc a bit more precise.