[UIFe] Replace gnome-taquin CC-BY-SA 2.0 images

[Jeremy Bicha]

Hi,

I'm requesting a User Interface Freeze Exception for GNOME Taquin, a
sliding puzzle game. Two cat images distributed with Taquin 3.18 are
licensed as CC-BY-SA 2.0. These images have been replaced in Taquin
3.20 with images that are considered redistributable by Debian.

It seems easiest to me to just SRU Taquin 3.20 then.

I believe the only other user-visible changes and changes that could
affect translations are:
1.) the copyright info in the About screen has been updated.
2.) the help has been marked as CC-BY-SA 4.0

Taquin is in universe and not included by default in any Ubuntu
flavors so I don't believe it's included in Ubuntu's language packs or
any Ubuntu-specific documentation.

https://bugs.launchpad.net/bugs/1588938

Thank you,
Jeremy Bicha