Image carousel jumps off-screen

[Cybr]

Related: #2273 (point 1)

When scrolling through the images, the current image is always displayed on the ultimate left side.

This calculation of the carousel is wrong because it eventually jumps off-container (Chrome on Windows 10):
​http://i.imgur.com/d5R4K7B.png

Also, I believe the currently selected image should be displayed in the middle, so you subconsciously know that there are more images at either the left or right side.

This is both a defect and enhancement, falling under one change.

[melchoyce]

Related: #2637

[tellyworth]

Can't reproduce the layout issue in the screenshot.

Thumbnails could certainly be improved, but probably won't be till we have a push on images.

[Cybr]

I believe the layout issue has since been fixed :)