[minor²] Rephrase dietpi-software whiptail entry

[cprima]

This is a minor suggestion to rephrase a whiptail menu as following:

Maybe it's just me: When presented the whiptail screen of dietpi-software I tend to be momentarily confused which item to select to proceed. (I install DietPi maybe 2 or 3 times a year). As is:
Install : Go >> Start installation for selected software

I suggest to change the "Go*" wording slightly.
Install : Mark this and go to <Ok> to start installation
or
Install : Ok >> Start installation for selected software

I considered to not report this because it feels too nit-picky. ;)

[MichaIng]

You actually do not need to select <Ok>. Just mark/select a menu entry and hit ENTER/RETURN. <Ok> is a very unnecessary button in such menus, but sadly there is no way to hide it in whiptail. Only the right side Cancel/Exit button can be hidden, but that one does have a reason, though hitting ESC does the same.

I wonder whether it helped more to change the text of the "Ok" button. Like "Select" or "Enter"? If we have "Ok" on the button and in the "Install" text, one could also get the impression that the button implicitly means to start installs, while it actually means to do whatever menu entry is currently highlighted/selected 🤔.