Glyphicon for #3411

…but it looks… blurry?  I'd rather use "icon-show-lines" but that set isn't in the bootstrap package used here.  

[capture decran 2014-05-04 a 1 10 21 pm](https://cloud.githubusercontent.com/assets/7093793/2873507/00db5a16-d3af-11e3-8dd2-1b9383661dc4.png)

[https://github.com/HabitRPG/habitrpg/issues/3411](https://github.com/HabitRPG/habitrpg/issues/3411)