ses jours de congé: I'm doing one of your translation tests - why is there no S on congé please, even though it's jours with an s? Thank you!

Hi Karen,

there's no s because congé is not an adjective but a noun. 

Jours de congé -- days of vacation. 

If you said instaid "jours congés" it would be an adjective and hence also pick up the s. The difference lying in the preposition "de". 

-- Chris (not a native speaker).