AP: Add a pulsating animation to indicate that adding an absence is in process..

[rebekatamberga]

When you add an absence, it takes a while to add it, so the cell just stays highlighted whilst it's processing..

It would be better, if the cell would have a SMOOTH 'pulsating' animation, so it goes from the highlighted transparent red color to the cells stationary color (before it's hovered over):

..... this is just to indicate the process of adding the absence.. this will improve user experience.