refactor sizesetting into unitsetting allowing more unit types with i18n support

src/i18n/en.json

@@ -395,6 +395,14 @@
         "desc": "To enable two-factor authentication, enter the code from your two-factor app:"
       }
     },
+    "units": {
+      "time": {
+        "m": "minutes",
+        "s": "seconds",
+        "h": "hours",
+        "d": "days"
+      }
+    },
     "lists_navigation": "Show lists in navigation",
     "allow_following_move": "Allow auto-follow when following account moves",
     "attachmentRadius": "Attachments",