Comment 35 for bug 425202

Patch to make it work for OS X packages too (based on current X11-based packaging). The python code very likely could be optimized - what I tried to implement:

if platform is 'darwin' then
  if $INKSCAPE_LOCALEDIR is set
    use it
  else
    if $PACKAGE_LOCALE_DIR is set
      use it
    else
      use fallback