Merge
Minor - space changes
Merge branch '1.9.x' of github.com:beeznest/chamilo-lms-icpna into icpna19
update footer v-learning
update css modulo icons
update css footer, icon completed module
Optimize the function that change the images colors to black and white -refs BT#7410
Optimize the function that change the images colors to black and white -refs BT#7410
progress bar css udpte
Fix link to modules
Comment some deprecated validations
Comment some deprecated validations
Fixing setSeriousGames see BT#7412
Minor - fixing PHP notice.
Fixing setPrerequisites see BT#7412
Minor - spacing corrections.
Merge branch '1.9.x' of github.com:cesarperales/chamilo-lms-icpna into 1.9.x
Adding try_once see BT#7414
Merge branch '1.9.x' of https://github.com/beeznest/chamilo-lms-icpna into 1.9.x
Fix URL in header logo