Deprecated attribute "title"

[Tejas2805]

The attribute "title" used for popovers and modals is deprecated. It may not be used in the future. Better to replace "title" with "header"

[damithc]

True. I'm waiting till the semester is over to fix this. As the book is used in other modules. I don't want to cause unnecessary updates (and merge conflicts) to the shared code.

[Tejas2805]

Sure! Lmk when can. Will help out.