use warnings;
use strict;
use Tk;

my @data = qw(null eins zwei drei);
my @data_2 = qw(nil one two three);

my @display;

my $mw = MainWindow->new;

for my $i (1..3) {
    push @display, $mw->Label(
        -textvariable=>\$data[$i],
    ) ->pack;
}

my $toggle_button = $mw->Button(
    -text=>"English!",
    -command=>sub{print \$data[1]; @data = @data_2; print \$data[1];},
    )->pack;
    
MainLoop;