- Improve multilanguage in help module and merge all language

interface/lib/classes/listform.inc.php

interface/lib/classes/listform_tpl_generator.inc.php

interface/web/help/lib/lang/bg_support_message_list.lng

interface/web/help/lib/lang/de_support_message_list.lng

interface/web/help/lib/lang/en_support_message_list.lng

interface/web/help/lib/lang/es.lng

interface/web/help/lib/lang/es_support_message.lng

interface/web/help/lib/lang/es_support_message_list.lng

interface/web/help/lib/lang/fr.lng

interface/web/help/lib/lang/fr_support_message.lng

interface/web/help/lib/lang/fr_support_message_list.lng

interface/web/help/lib/lang/nl_support_message_list.lng

interface/web/help/lib/lang/ru.lng

interface/web/help/lib/lang/ru_support_message_list.lng

interface/web/help/lib/lang/se.lng

interface/web/help/lib/lang/se_support_message.lng

interface/web/help/lib/lang/se_support_message_list.lng