[FrameworkBundle] Synced German validator translation

src/Symfony/Bundle/FrameworkBundle/Resources/translations/validators.de.xliff

@@ -112,7 +112,7 @@
             </trans-unit>
             <trans-unit id="28">
                 <source>This form should not contain extra fields</source>
-                <target>Diese Feldgruppe sollte keine zusätzlichen Felder enthalten</target>
+                <target>Dieses Formular sollte keine zusätzlichen Felder enthalten</target>
             </trans-unit>
             <trans-unit id="29">
                 <source>The uploaded file was too large. Please try to upload a smaller file</source>