Fix widgets alignment on the right

[Not sure it's Studio problem or runtime problem]
Using 5.7.2 of 2013-07-31

Can be checked in the following project: https://connect.nuxeo.com/nuxeo/site/studio/ide?project=nuxeo-studio-ci-ui

An "InsClaim" document type defines some fields.
The layouts (create/view/edit) are bound to the "insClaimLayout", which defines the layout with 2 columns.

At runtime, there is a hige blank space between labels and fields (see screenshot)