test(samples): change string for utf8 translation (#48)

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-translate/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
- [ ] Ensure the tests and linter pass
- [ ] Code coverage does not decrease (if any source code was changed)
- [ ] Appropriate docs were updated (if necessary)

Fixes #46  🦕

Author: busunkim96

translation/samples/snippets/snippets_test.py

@@ -43,7 +43,7 @@ def test_translate_text(capsys):
 
 
 def test_translate_utf8(capsys):
-    text = u'나는 파인애플을 좋아한다.'
+    text = u'파인애플 13개'
     snippets.translate_text('en', text)
     out, _ = capsys.readouterr()
-    assert u'I like pineapple' in out
+    assert u'13 pineapples' in out