add some translations

client/coral-admin/src/containers/Dashboard/Widget.css

@@ -23,7 +23,6 @@
   padding-left: 10px;
   font-size: 1.5rem;
   font-weight: bold;
-  background-color: #e0e0e0;
 }
 
 .widgetTable {

client/coral-admin/src/translations.json

@@ -136,6 +136,7 @@
       "no_flags": "There have been no flags in the last 5 minutes! Hooray!",
       "no_likes": "There have been no likes in the last 5 minutes. All quiet.",
       "flags": "Flags",
+      "no_activity": "There haven't been any comments anywhere in the last five minutes.",
       "comment_count": "comments"
     },
     "streams": {
@@ -283,6 +284,7 @@
       "no_flags": "¡Nadie ha marcado nada en los últimos 5 minutos! ¡Bravo!",
       "no_likes": "A nadie le ha gustado algún comentario en los últimos 5 minutos. Todo tranquilo.",
       "flags": "Marcados",
+      "no_activity": "No hubo comentarios en los ultimos 5 minutos",
       "comment_count": "comentarios"
     },
     "streams": {