added icons to the lists

interface/web/admin/list/firewall.list.php

interface/web/admin/list/server.list.php

interface/web/admin/list/software_repo.list.php

interface/web/admin/templates/server_list.htm

interface/web/dns/list/dns_a.list.php

interface/web/dns/list/dns_soa.list.php

interface/web/mail/list/mail_alias.list.php

interface/web/mail/list/mail_blacklist.list.php

interface/web/mail/list/mail_content_filter.list.php

interface/web/mail/list/mail_domain.list.php

interface/web/mail/list/mail_domain_catchall.list.php

interface/web/mail/list/mail_forward.list.php

interface/web/mail/list/mail_get.list.php

interface/web/mail/list/mail_spamfilter.list.php

interface/web/mail/list/mail_transport.list.php

interface/web/mail/list/mail_whitelist.list.php

interface/web/mail/list/spamfilter_blacklist.list.php

interface/web/mail/list/spamfilter_policy.list.php

interface/web/mail/list/spamfilter_users.list.php

interface/web/mail/list/spamfilter_whitelist.list.php