lightbox2 5.x-2.3

Changes since DRUPAL-5--2-2:

• #208800 - allow users to select which image to view in the lightbox (original, preview, etc) Original patch provided by sinasalek.
• #208800 - changed imagecache filters so it's now possible to select which size image should appear in the lightbox, along with the view.
• allow users to pick which image sizes will trigger a lightbox
• #212086 - added a new filter tip and more information, including example code, to the compose tips page.
• #207540 - added separate option to disable lightbox2 for nested acidfree galleries.
• #210866 - added in ability to set the overlay opacity value on the configuration screen.
• #212460 - added right-to-left (rtl) language support.
• #207495 - increased z-index for lightbox elements as some themes have elements which were appearing above the lightbox, e.g. tech theme.
• fix for caption and keyboard msg text not appearing in IE.
• #184170 - patch for SWFObject conflict
• split the settings form in two
• removed trailing whitespace.
• Removed needless watchdog function calls.
• Fixed $Id$ line
• Updated language translation template file