Update COPS to 0.5.0

* Upgrade COPS UI to HTML5 / CSS3 to hopefully make it prettier. Most of the code was contributed by Thomas Severinsen.
  * Add the number of books in each databases (when multiple database is enabled).
  * Add Norwegian Bokmål strings. Thanks to Rune Mathisen for the pull request.
  * Add a split by language of catalog. Thanks to Puiu Ionut for the pull request.
  * You can now change the theme and fancybox use on all your devices (You have to enable cookies).
  * Add an eink theme. Thanks to Gregory Bodin for the code.