extract some strings from views/modal

app/assets/javascripts/discourse/views/modal/edit_category_view.js

@@ -23,7 +23,7 @@ Discourse.EditCategoryView = Discourse.ModalBodyView.extend({
 
   title: (function() {
     if (this.get('category.id')) return Em.String.i18n("category.edit_long");
-    return "Create Category";
+    return Em.String.i18n("category.create");
   }).property('category.id'),
 
   buttonTitle: (function() {

app/assets/javascripts/discourse/views/modal/history_view.js

@@ -8,7 +8,7 @@
 **/
 Discourse.HistoryView = Discourse.View.extend({
   templateName: 'history',
-  title: 'History',
+  title: Em.String.i18n('history'),
   modalClass: 'history-modal',
 
   loadSide: function(side) {

config/locales/client.en.yml

@@ -585,6 +585,7 @@ en:
     likes: "Likes"
     top_contributors: "Participants"
     category_title: "Category"
+    history: "History"
 
     categories_list: "Categories List"