Indicates that multiple IVariable will be changed and localized string should wait for PersistentVariablesSource.EndUpdate before updating. See PersistentVariablesSource.EndUpdating and PersistentVariablesSource.EndUpdate. Note: PersistentVariablesSource.BeginUpdating and PersistentVariablesSource.EndUpdating can be nested, PersistentVariablesSource.EndUpdate will only be called after the last PersistentVariablesSource.EndUpdating.