fix: increase timeout for batch translate document (#708)

Change-Id: I4e604288729e77a2bc8a31c749a89ee662cb3ff8

Fixes #698  🦕

Author: aribray

translate/test/v3beta1/translate_batch_translate_document.test.js

@@ -61,7 +61,7 @@ describe(REGION_TAG, () => {
     );
     assert.match(output, /Total Pages: /);
 
-    this.timeout(500000);
+    this.timeout(750000);
   });
 
   // Delete the folder from GCS for cleanup