[Postfix] Allow to set and override a relayhost per mailbox

[Web] Replace recycle icon with trash (this one made me a bit sad)
[Web] Various small fixes
[Web] Allow or disallow a domain admin to change relayhost settings (default is off, as previous default)

data/web/lang/lang.en.json

@@ -27,6 +27,8 @@
         "tls_policy": "TLS policy",
         "unlimited_quota": "Unlimited quota for mailboxes",
         "domain_desc": "Change domain description",
+        "mailbox_relayhost": "Change relayhost for a mailbox",
+        "domain_relayhost": "Change relayhost for a domain",
         "xmpp_admin": "Promote XMPP user to administrator",
         "xmpp_domain_access": "Configure XMPP domain access",
         "xmpp_mailbox_access": "Configure XMPP user access",
@@ -553,6 +555,7 @@
         "kind": "Kind",
         "mailbox": "Edit mailbox",
         "mailbox_quota_def": "Default mailbox quota",
+        "mailbox_relayhost_info": "Applied to the mailbox and direct aliases only, does override a domain relayhost.",
         "max_aliases": "Max. aliases",
         "max_mailboxes": "Max. possible mailboxes",
         "max_quota": "Max. quota per mailbox (MiB)",
@@ -592,7 +595,7 @@
         "save": "Save changes",
         "scope": "Scope",
         "sender_acl": "Allow to send as",
-        "sender_acl_disabled": "↳ <span class=\"label label-danger\">Sender check is disabled</span>",
+        "sender_acl_disabled": "<span class=\"label label-danger\">Sender check is disabled</span>",
         "sender_acl_info": "If mailbox user A is allowed to send as mailbox user B, the sender address is not automatically displayed as selectable \"from\" field in SOGo.<br>\r\n  Mailbox user B needs to create a delegation in SOGo to allow mailbox user A to select their address as sender. To delegate a mailbox in SOGo, use the menu (three dots) to the right of your mailbox name in the upper left while in mail view. This behaviour does not apply to alias addresses.",
         "sieve_desc": "Short description",
         "sieve_type": "Filter type",
@@ -1018,6 +1021,7 @@
         "eas_reset_help": "In many cases a device cache reset will help to recover a broken ActiveSync profile.<br><b>Attention:</b> All elements will be redownloaded!",
         "eas_reset_now": "Reset now",
         "edit": "Edit",
+        "empty": "No results",
         "email": "Email",
         "email_and_dav": "Email, calendars and contacts",
         "encryption": "Encryption",