Merge pull request #907 from Eiber/feature/UI-improvement

gui/slick/css/dark.css

gui/slick/css/light.css

gui/slick/css/style.css

gui/slick/interfaces/default/home_addExistingShow.tmpl

gui/slick/interfaces/default/home_massAddTable.tmpl

gui/slick/interfaces/default/home_newShow.tmpl

gui/slick/interfaces/default/inc_addShowOptions.tmpl

gui/slick/interfaces/default/inc_qualityChooser.tmpl

gui/slick/interfaces/default/inc_top.tmpl