Merge branch '2.7.x' of https://github.com/centreon/centreon into 2.7.x

www/Themes/Centreon-2/color_css.php

www/Themes/Centreon-2/style.css

www/img/icons/clock.png

www/img/icons/database.png

www/img/icons/poller.png

www/img/icons/warning.png

www/include/monitoring/acknowlegement/xsl/popupForAck.xsl

www/include/monitoring/downtime/xsl/popupForDowntime.xsl

...de/monitoring/objectDetails/template/serviceDetails.ihtml

www/include/monitoring/status/Services/xsl/popupForHost.xsl

...nclude/monitoring/status/Services/xsl/popupForService.xsl

www/include/monitoring/status/Services/xsl/service.xsl

www/menu/templates/BlockHeader.ihtml