edit panel control: courses
list_courses
single_course
Revert "single_course"

This reverts commit 7d84dc6fa953ec49dcd277a16dde77b7af501559.
Revert "Revert "single_course""

This reverts commit d8c466d078062c14b83272ac67b457cf8b14b602.
add 'slogan' on course panel control
change paanel control course, add 'date'
changes error dates on edit course and project
change on courses, add date course on public