if ($head_de and $deutsch and ($check1 or $check2 or $check3 or $check4) and $ersteller and $werk)
    {
       ....
       $merker = 1;
    }
if ($head_en and $englisch and ($check1 or $check2 or $check3 or $check4) and $ersteller and $werk)
    {
     .....
      $merker = 1;
     }
if ($head_fr and $franz and ($check1 or $check2 or $check3 or $check4) and $ersteller and $werk)
     {
    .....
     $merker = 1;
     }