Added typedefs for date-utils (#35071)

types/date-utils/date-utils-tests.ts

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+import dateUtils = require("date-utils");
+
+dateUtils('es');
+dateUtils('fr');
+dateUtils('pt-BR');

types/date-utils/index.d.ts

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+// Type definitions for date-utils 1.2
+// Project: https://jerrysievert.github.io/date-utils/
+// Definitions by:  Adam Zerella <https://github.com/adamzerella>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+type LanguageType = 'es' | 'fr' | 'pt-BR';
+
+declare function language(lang: LanguageType): string;
+
+export = language;

types/date-utils/tsconfig.json

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+{
+    "compilerOptions": {
+      "module": "commonjs",
+      "lib": [
+        "es6"
+      ],
+      "noImplicitAny": true,
+      "noImplicitThis": true,
+      "strictNullChecks": true,
+      "strictFunctionTypes": true,
+      "baseUrl": "../",
+      "typeRoots": [
+        "../"
+      ],
+      "types": [
+
+      ],
+      "noEmit": true,
+      "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+      "index.d.ts",
+      "date-utils-tests.ts"
+    ]
+}

types/date-utils/tslint.json

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+{
+    "extends": "dtslint/dt.json"
+}