fix of name translation due to incorrect display in lists and forms

lng/de.lng.php

@@ -545,6 +545,7 @@ return [
 		'documentroot' => 'Heimatverzeichnis',
 		'name' => 'Name',
 		'firstname' => 'Vorname',
+		'lastname' => 'Nachname',
 		'company' => 'Firma',
 		'nameorcompany_desc' => 'Entweder Vorname/Name oder Firma ist erforderlich',
 		'street' => 'Straße',

lng/en.lng.php

@@ -586,8 +586,9 @@ return [
 	],
 	'customer' => [
 		'documentroot' => 'Home directory',
-		'name' => 'Last name',
+		'name' => 'Name',
 		'firstname' => 'First name',
+		'lastname' => 'Last name',
 		'company' => 'Company',
 		'nameorcompany_desc' => 'Either firstname/lastname or company is required',
 		'street' => 'Street',