Extended client delete dialog (Implements #4370)

interface/web/client/client_del.php

interface/web/client/lib/lang/ar_client_del.lng

interface/web/client/lib/lang/bg_client_del.lng

interface/web/client/lib/lang/br_client_del.lng

interface/web/client/lib/lang/ca_client_del.lng

interface/web/client/lib/lang/cz_client_del.lng

interface/web/client/lib/lang/de_client_del.lng

interface/web/client/lib/lang/dk_client_del.lng

interface/web/client/lib/lang/el_client_del.lng

interface/web/client/lib/lang/en_client_del.lng

interface/web/client/lib/lang/es_client_del.lng

interface/web/client/lib/lang/fi_client_del.lng

interface/web/client/lib/lang/fr_client_del.lng

interface/web/client/lib/lang/hr_client_del.lng

interface/web/client/lib/lang/hu_client_del.lng

interface/web/client/lib/lang/id_client_del.lng

interface/web/client/lib/lang/it_client_del.lng

interface/web/client/lib/lang/ja_client_del.lng

interface/web/client/lib/lang/nl_client_del.lng

interface/web/client/lib/lang/pl_client_del.lng