Issue board: add button "fit columns to current page width"

Currently the columns of the issue-lists are wide on often you have to scroll horizontally to see the other issue-lists:

When I want to move tickets between columns or I want to get an overview, I reduce the font-size in my browser:

But this also reduces the size of the links in the menu, dropdown-lists, ...

Thus, it would be nice to reduce the font-size only of the colums to fit the page size.

I think a button with the function "reduce the font size of columns to fit the current page width" would be great.