Prints the given trigger into a string.
This function is returning a translated string for presentation to end users for example in menu items or in help texts.
display in use may influence the resulting string in various forms, such as resolving hardware keycodes or by causing
display-specific modifier names.
The form of the representation may change at any time and is not guaranteed to stay identical.
`GdkDisplay` to print for
a `GString` to print into
true if something was printed or false if the trigger did not have a textual representation suitable for end users.