[Victor D]

Into the main.css:
#1
.tabs a:link, .tabs a:visited, .tabs a:hover, .tabs a:active {padding:5px 0 5px 5px;}

(As there is not enough space to float all the items, so some of them go below)

#2

.menu-dialog .title-bar img.icon{display:none}
.menu-dialog .title-bar {text-align:center}

(You probably removed icons, but they are still consume space in the title when alligning as their holders preserve their width )