limit the width of vote columns

if you've selected the option 'Display Person Name in Review Category'
we now have *very long* names, including CI systems, which push the
columns extremely wide.

Instead limit the max-width of these columns. This will typically lead
to truncation of long names, however the disambiguation of who is
voting isn't really impacted by the truncation. Overflow set to
hidden to keep text from piling up on itself.

Change-Id: I78cc679cbbe3ca298049571bd24e08807685dcae
Merge "limit the width of vote columns"