So, the issue is that you are using multiple selection checkboxes, multiple selection checkboxes pass their values as an array.
you need to convert the array to a comma seperated list.
add the following code at line 1:
<?php
if($_SERVER["REQUEST_METHOD"] == "POST") {
foreach($_POST as $key => $val) {
if(is_array($_POST[$key])) $_POST[$key] = implode(", ", $_POST[$key]);
}
}
?>
then in the insert behaivor, the bindings for the columns that use checkboxes will need to be modified slightly. the code in the binding will have a [] at the end of the checkbox name:
<?php echo((isset($_POST["Sprache[]"]))?$_POST["Sprache[]"]:"") ?>
remove the [] from the end:
<?php echo((isset($_POST["Sprache"]))?$_POST["Sprache"]:"") ?>