Default [Q] Icon shortcut image locations

I'm new here and German so apologies ahead for bad English and if this is a stupid question. I recently bought a gs4 and a tab3 and rooted them successfully, what I am trying to figure out is where do these devices keep icons you move from browser to home screen. Reason I ask is my bank has no app, but does have mobile banking with no favicon so when I make shortcut to this it is blank image and I want to change it to their logo if possible.

I am sure this seems dumb but with all the other customizable things I have learned you can do with these devices there has to be somewhere in root browser I can find the image or make my own shortcut or something. . Along with tell my bank their Web designer is poor haha.

Thank for any suggestions!