adding a "revert change" button on the settings page

[max]

As mentioned in #131, I found myself looking for an easy way to revert multiple unwanted changes made through the game. The best UI proposition I could come with would be to add a X button per statements line at http://tools.wmflabs.org/wikidata-game/#mode=settings , with a "undo" label. Or just a undo link, to match wikipedia conventions

[Waldir Pimenta]

Isn't this a dupe of #29?

[Hsarrazin]

yes, it is, Waldir :)

[max]

Duplicate of #29.

[max]

argh, sorry @waldyrious , I did read your comment to fast and didn't see the reference to #29. two issues, two dupes, sorry, I will be more cautious next time :)

[Waldir Pimenta]

No problem :) For clarification / future reference, the comment @maxlath is referring to above is actually in issue #131, not the one I made here.