[Web][Rspamd] implement custom mailbox attributes and improve domain wide footer

data/web/lang/lang.en-gb.json

@@ -576,6 +576,7 @@
         "client_secret": "Client secret",
         "comment_info": "A private comment is not visible to the user, while a public comment is shown as tooltip when hovering it in a user's overview",
         "created_on": "Created on",
+        "custom_attributes": "Custom attributes",
         "delete1": "Delete from source when completed",
         "delete2": "Delete messages on destination that are not on source",
         "delete2duplicates": "Delete duplicates on destination",
@@ -592,7 +593,8 @@
             "from_user": "{= from_user =}   - From user part of envelope, e.g for \"moo@mailcow.tld\" it returns \"moo\"",
             "from_name": "{= from_name =}   - From name of envelope, e.g for \"Mailcow <moo@mailcow.tld>\" it returns \"Mailcow\"",
             "from_addr": "{= from_addr =}   - From address part of envelope",
-            "from_domain": "{= from_domain =} - From domain part of envelope"
+            "from_domain": "{= from_domain =} - From domain part of envelope",
+            "custom": "{= foo =}         - If mailbox has the custom attribute \"foo\" with value \"bar\" it returns \"bar\""
         },
         "domain_footer_plain": "PLAIN footer",
         "domain_quota": "Domain quota",
@@ -623,6 +625,7 @@
         "max_quota": "Max. quota per mailbox (MiB)",
         "maxage": "Maximum age of messages in days that will be polled from remote<br><small>(0 = ignore age)</small>",
         "maxbytespersecond": "Max. bytes per second <br><small>(0 = unlimited)</small>",
+        "mbox_exclude": "Exclude mailboxes",
         "mbox_rl_info": "This rate limit is applied on the SASL login name, it matches any \"from\" address used by the logged-in user. A mailbox rate limit overrides a domain-wide rate limit.",
         "mins_interval": "Interval (min)",
         "multiple_bookings": "Multiple bookings",
@@ -1141,6 +1144,7 @@
         "apple_connection_profile_complete": "This connection profile includes IMAP and SMTP parameters as well as CalDAV (calendars) and CardDAV (contacts) paths for an Apple device.",
         "apple_connection_profile_mailonly": "This connection profile includes IMAP and SMTP configuration parameters for an Apple device.",
         "apple_connection_profile_with_app_password": "A new app password is generated and added to the profile so that no password needs to be entered when setting up your device. Please do not share the file as it grants full access to your mailbox.",
+        "attribute": "Attribute",
         "change_password": "Change password",
         "change_password_hint_app_passwords": "Your account has %d app passwords that will not be changed. To manage these, go to the App passwords tab.",
         "clear_recent_successful_connections": "Clear seen successful connections",
@@ -1271,6 +1275,7 @@
         "tls_policy_warning": "<strong>Warning:</strong> If you decide to enforce encrypted mail transfer, you may lose emails.<br>Messages to not satisfy the policy will be bounced with a hard fail by the mail system.<br>This option applies to your primary email address (login name), all addresses derived from alias domains as well as alias addresses <b>with only this single mailbox</b> as target.",
         "user_settings": "User settings",
         "username": "Username",
+        "value": "Value",
         "verify": "Verify",
         "waiting": "Waiting",
         "week": "week",