Replace foreign letters used in field labels when dynamically creating field names. There's only a few here, these are the ones that are used in scandinavia.

replace-germanic.js

$('#acf_fields tr.field_label input.label').live('blur', function()
{
	var label = $(this);
	var name = $(this).closest('tr').siblings('tr.field_name').find('input.name');

	if(name.val() == '')
	{
		var val = label.val();
		var ex = {
			'ä': 'a',
			'æ': 'a',
			'å': 'a',
			'ö': 'o',
			'ø': 'o',
			'é': 'e',
			'ë': 'e'
		};
		for(letter in ex) {
			var regex = new RegExp( letter, 'g' );
			val = val.replace( regex, ex[letter] );
		}
		val = val.toLowerCase().split(' ').join('_').split('\'').join('');
		name.val(val);
		name.trigger('keyup');
	}
});