Add plugin and re organize the code
Modify Path, names and format code - refs bcourse
MOdify variables name
Rename variables
Add plugin tab
rename variables
add plugin lang to templates
Instance protected plugin correctly and modify default sanbox value
Improve code, translate some variables and modify some comments
Thorough review of the BuyCourses plugin - refs #5464
Final touch to BuyCourses plugin before 1.9.8 - refs #5464
Updated plugin info