Not sure but you can already claim back 20% of your fees if its an approved course.
These Revenue booklets don't mention any €5K limit. They do mention a qualifying amount lower limit of €315 and an upper limit of €1,270 for tuition fees for IT and foreign language courses though.AFAIK relief can be claimed on fees up to a max of Eur 5000 only, which means a maximum Eur 1000 refund.