Fix redundant aliases in command palette

packages/vscode/src/fill/platform.ts

@@ -0,0 +1,12 @@
+import * as platform from "vs/base/common/platform";
+
+// Use en instead of en-US since that's vscode default and it uses
+// that to determine whether to output aliases which will be redundant.
+if (platform.locale === "en-US") {
+	// tslint:disable-next-line no-any to override const
+	(platform as any).locale = "en";
+}
+if (platform.language === "en-US") {
+	// tslint:disable-next-line no-any to override const
+	(platform as any).language = "en";
+}