AMBARI-3318. Use correct case for YARN. (yusaku)

ambari-web/app/data/HDP2/global_properties.js

@@ -629,7 +629,7 @@ module.exports =
     {
       "id": "puppet var",
       "name": "yarn_heapsize",
-      "displayName": "Yarn Java heap size",
+      "displayName": "YARN Java heap size",
       "description": "Max heapsize for all YARN components",
       "defaultValue": "1024",
       "isOverridable": false,

ambari-web/app/messages.js

@@ -419,8 +419,8 @@ Em.I18n.translations = {
   'installer.step4.multipleDFS.popup.body':'You selected more than one file system. We will automatically select only HDFS. Is this OK?',
   'installer.step4.mapreduceCheck.popup.header':'MapReduce Needed',
   'installer.step4.mapreduceCheck.popup.body':'You did not select MapReduce, but it is needed by other services you selected. We will automatically add MapReduce. Is this OK?',
-  'installer.step4.yarnCheck.popup.header':'Yarn+MarReduce2 Needed',
-  'installer.step4.yarnCheck.popup.body':'You did not select Yarn+MarReduce2, but it is needed by other services you selected. We will automatically add Yarn+MarReduce2. Is this OK?',
+  'installer.step4.yarnCheck.popup.header':'YARN+MapReduce2 Needed',
+  'installer.step4.yarnCheck.popup.body':'You did not select YARN+MapReduce2, but it is needed by other services you selected. We will automatically add YARN+MapReduce2. Is this OK?',
   'installer.step4.zooKeeperCheck.popup.header':'ZooKeeper Needed',
   'installer.step4.zooKeeperCheck.popup.body':'You did not select ZooKeeper, but it is needed by other services you selected. We will automatically add ZooKeeper. Is this OK?',
   'installer.step4.monitoringCheck.popup.header':'Limited Functionality Warning',