Spark features with dashboard are enabled (#3883)

* Spark features are enabled

* Fixed as PR comments

* minor change

* PR comments fixed

* minor fix

* change constant name to avoid conflicts with sqlopsextension

* sqlContext to context

* Changed tab name to SQL Server Big Data Cluster

* Added isCluster to ContextProvider to control display big data cluster dashboard tab
Ported New/open Notebook code to mssql extension and enable them in dashboard

* Fixed tslint

extensions/mssql/package.nls.json

@@ -5,10 +5,24 @@
 	"json.schemas.fileMatch.item.desc": "A file pattern that can contain '*' to match against when resolving JSON files to schemas.",
 	"json.schemas.schema.desc": "The schema definition for the given URL. The schema only needs to be provided to avoid accesses to the schema URL.",
 	"json.format.enable.desc": "Enable/disable default JSON formatter (requires restart)",
+
 	"mssqlCluster.uploadFiles": "Upload files",
 	"mssqlCluster.mkdir": "New directory",
 	"mssqlCluster.deleteFiles": "Delete",
 	"mssqlCluster.previewFile": "Preview",
 	"mssqlCluster.saveFile": "Save",
-	"mssqlCluster.copyPath": "Copy Path"
+	"mssqlCluster.copyPath": "Copy Path",
+
+	"notebook.command.new": "New Notebook",
+	"notebook.command.open": "Open Notebook",
+
+	"tab.bigDataClusterDescription": "Tasks and information about your SQL Server Big Data Cluster",
+	"title.bigDataCluster": "SQL Server Big Data Cluster",
+    "title.submitSparkJob": "Submit Spark Job",
+    "title.newSparkJob": "New Spark Job",
+    "title.openSparkHistory": "View Spark History",
+    "title.openYarnHistory": "View Yarn History",
+    "title.tasks": "Tasks",
+    "title.installPackages": "Install Packages",
+    "title.configurePython": "Configure Python for Notebooks"
 }