Pet peeve time: reduce clutter from common $wgContLang->isRTL() ? 'x' : 'y' pattern. :)

Pet peeve time: reduce clutter from common $wgContLang->isRTL() ? 'x' : 'y' pattern. :)

Introduced helpers:
  $lang->getDir() returns 'ltr' or 'rtl' for HTML 'dir' attrib
  $lang->alignStart() returns 'left' or 'right' for HTML 'align' attrib or CSS 'text-align' property
  $lang->alignEnd() returns 'right' or 'left'

And cleaned up a couple arrays of icons to just reverse the order of items rather than repeating the items twice for each possibility.