feat: check status of long running operation by its name; fix linting (#531)

For each client method returning a long running operation, a separate method to check its status is added.

Added methods: `checkBatchTranslateTextProgress`, `checkCreateGlossaryProgress`, `checkDeleteGlossaryProgress`.

Author: alexander-fenster

translate/automl/automlTranslationDataset.js

@@ -20,7 +20,7 @@
  * https://cloud.google.com/translate/automl/docs
  */
 
-`use strict`;
+'use strict';
 
 async function createDataset(projectId) {
   // [START automl_translation_create_dataset]

translate/automl/automlTranslationModel.js

@@ -20,7 +20,7 @@
  * https://cloud.google.com/translate/automl/docs
  */
 
-`use strict`;
+'use strict';
 
 async function createModel(projectId, computeRegion, datasetId, modelName) {
   // [START automl_translation_create_model]

translate/automl/automlTranslationPredict.js

@@ -20,7 +20,7 @@
  * https://cloud.google.com/translate/automl/docs
  */
 
-`use strict`;
+'use strict';
 
 async function predict(
   projectId,