Use system fonts in select lists as fall back

As of today, Safari and IE do not support webfonts in select lists.
Since we need a monospace font to preserve the alignment of padded
information in the filter lists, I applied system fonts to the
select lists instead.

I listed the web font last, with the intent of using it instead of
system fonts on operating systems without Safari or IE anyway.
Merge branch 'enhancements'
Merge branch 'master' into gh-pages