Issue #1069: Fix truncated data warning text
Issue #1069: Fix truncated data warning text

Fixes the truncated data warning text showing in the MountainChart data warning
pop-up by using a CSS3 flexbox in the vzb-data-warning-box container.

Reduces the top margin of the vzb-data-warning-title container by 10 pixels to
accommodate spacing from flexbox.

dab2000/vizabi,buchslava/vizabi,vizabi/vizabi,jdk137/vizabi,Gapminder/vizabi,buchslava/vizabi,vizabi/vizabi,Gapminder/vizabi,sergey-filipenko/vizabi,buchslava/vizabi,jdk137/vizabi,dab2000/vizabi,dab2000/vizabi,Gapminder/vizabi,sergey-filipenko/vizabi,jdk137/vizabi,sergey-filipenko/vizabi