changed to base model

Author: puneithk

translate/src/main/java/com/google/cloud/translate/samples/TranslateText.java

@@ -78,7 +78,7 @@ public static void translateTextWithOptions(
     TranslateOption tgtLang = TranslateOption.targetLanguage(targetLang);
 
     //Use translate `model` parameter with `base` and `nmt` options
-    TranslateOption model = TranslateOption.model("nmt");
+    TranslateOption model = TranslateOption.model("base");
 
     Translation translation = translate.translate(sourceText, srcLang, tgtLang, model);
     out.printf("Source Text:\n\tLang: %s, Text: %s\n", sourceLang, sourceText);