UX: tooltips and improvements to new dashboard

- tooltips
- revert chart title UI
- reduce period chooser font-size
- localize dates of data points
- fix a bug where multiple reports were loaded at the same time
- fix a bug where % was not showing anymore
- remove spacing at the top
- remove loadingTitle feature (Loading...%report name%) incompatible with new hijack design

test/javascripts/fixtures/daily-engaged-users.js.es6

@@ -13,7 +13,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": null,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/dau-by-mau.js.es6

@@ -13,7 +13,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": 46,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/new-contributors.js.es6

@@ -42,7 +42,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": null,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/posts.js.es6

@@ -12,7 +12,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": 0,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/signups.js.es6

@@ -39,7 +39,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": 0,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/topics.js.es6

@@ -12,7 +12,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": 0,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/trending-search.js.es6

@@ -12,7 +12,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": null,
-      "labels": ["Term", "Searches", "Unique"]
+      "labels": ["Term", "Searches", "Unique"],
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/users-by-trust-level.js.es6

@@ -13,7 +13,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": null,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };

test/javascripts/fixtures/users-by-type.js.es6

@@ -13,7 +13,8 @@ export default {
       "category_id": null,
       "group_id": null,
       "prev30Days": null,
-      "labels": null
+      "labels": null,
+      "report_key": ""
     }
   }
 };