Localize ha-relative-time (#1241)

* Localize relative time

* Add mixin

* Pass hass to ha-relative-time

* Remove debug

* Add hass

* Add hass everywhere

* Remove value from translation file

* Add quotes to attributes

* Lint

* Fix in hassio file

* Use current placeholder syntax

* Use correct syntax

* Move to ui.components

src/components/entity/state-info.js

@@ -62,7 +62,7 @@ class StateInfo extends PolymerElement {
 
       <template is="dom-if" if="[[inDialog]]">
         <div class="time-ago">
-          <ha-relative-time datetime="[[stateObj.last_changed]]"></ha-relative-time>
+          <ha-relative-time hass="[[hass]]" datetime="[[stateObj.last_changed]]"></ha-relative-time>
         </div>
       </template>
       <template is="dom-if" if="[[!inDialog]]">
@@ -80,14 +80,9 @@ class StateInfo extends PolymerElement {
         type: Boolean,
         value: false,
       },
-
-      stateObj: {
-        type: Object,
-      },
-
-      inDialog: {
-        type: Boolean,
-      },
+      hass: Object,
+      stateObj: Object,
+      inDialog: Boolean
     };
   }