Add button visibility and text

Hi all,
I built an app using Bootstrap template. I modified the list page html in order to have 'Add' and 'Inlide Add' buttons visible on mobile (i made that just putting them in a <div> container that is not hidden on mobile). Now I would like to do 2 things :
- change button text, didn't find how to.
- hide one of the two Add button on mobile. How can i do?

Any help wil be appreciated.
many thanks
F