Allow sorting symbols to stay on the same line as the cell text

Problem currently visible on the tables at http://git.bo/issues and http://git.bo/repos
Tested on Firefox and Chrome, Ubuntu 12.04

before:
![before](http://img268.imageshack.us/img268/1936/selection001r.png)
after:
![before](http://img842.imageshack.us/img842/7433/selection002o.png)