jquery.confirmable: Add a space between buttons
It should have always been there, my bad. Problems with lack of the
space:
* Languages with ligatures may decide to join the last letters of
"Yes" with first letters of "No", producing a mess. (This was
reported with a proposed solution as I0e6fcd83, I opted for doing
this fix instead.)
* The "Yes" and "No" may be read together by screen readers, as
"Yesno" (although I didn't test this), and similarly misinterpreted
by other tools.
* The interface looks silly when copy-pasted.
Change-Id: I65c771fc22e105bf5978e6e4ee5068200f294b9e