Issue56: Changed way how to set the form and window to readonly. Now all dialogs should habe proper readonly settings. Now the Save and Cancel button are displayed as needed.

/**
 * Store for Zusatzwerte
 */
Ext.define('Lada.store.Zusatzwerte', {
    extend: 'Ext.data.Store',
    model: 'Lada.model.Zusatzwert'
});