mail: make virtual "All Mail" togglable

Mac clients behave poorly when this virtual mailbox is present

dashboard/src/translation/en.json

@@ -677,7 +677,8 @@
             "solrRunning": "Running",
             "solrNotRunning": "Not Running",
             "acl": "Mail ACL",
-            "aclOverview": "{{ dnsblZonesCount }} DNSBL zone(s)"
+            "aclOverview": "{{ dnsblZonesCount }} DNSBL zone(s)",
+            "virtualAllMail": "\"All Mail\" Folder"
         },
         "eventlog": {
             "title": "Email Event Log",
@@ -768,6 +769,10 @@
         },
         "action": {
             "queue": "Queue"
+        },
+        "changeVirtualAllMailDialog": {
+            "title": "\"All Mail\" Folder",
+            "description": "The \"All Mail\" folder is a single folder that contains all the mails in your Inbox. The folder can be useful in mail clients that do not support recursive folder search."
         }
     },
     "network": {