Update bootstrap to 3.3.1

Update bootstrap to 3.3.1.
This requires intense testing on mobile before merging.
[Test Link](http://mf-geoadmin3.int.bgdi.ch/gal_update_bootstrap)

Catalog info buttons are now a little bigger, which I personnally prefer.
A `positon:absolute` without top, left coordinates seems weird. Putting a `line-height:20px` on label seems align correctly vertically the text with the checkbox.