changing api_get_datetime function by api_get_utc_datetime -refs #7131
Showing special courses in into display all -refs #7131
chnages in course catalog display all -refs #7137
coding convention fix -refs #7137
Merge branch 'yoselyn.7137' of github.com:ycastillo/chamilo-lms into ycastillo-yoselyn.7137
Merge pull request #295 from ycastillo/yoselyn.7137

Showing special courses in into display all -refs #7131
Use json_encode instead of addslashes
css menu update #7144
update img help course lesson #7142
css update scorm
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into ycastillo-yoselyn.7137
Merge datetime function calls changes - refs #7131
Merge pull request #300 from uppa/uppa.7155

Fixes #7155 : Exercice description bug
Merge branch '1.9.x' of github.com:chamilo/chamilo-lms into 1.9.x
updating and tidy code, as well free notification sound #7147