feat(translate): make 'parent' argument required for all client methods; add 'labels' argument (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/translate/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:6068f67900a3f0bdece596b97bda8fc70406ca0e137a941f4c81d3217c994a80
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/cloud/translate/artman_translate_v3beta1.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/translate-v3beta1.
synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/cloud/translate/v3beta1/translation_service.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/translate-v3beta1/google/cloud/translate_v3beta1/proto/translation_service.proto
synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/translate-v3beta1/google/cloud/translate_v3beta1/proto.
synthtool > Replaced 'google.cloud.translation_v3beta1.proto' in google/cloud/translate_v3beta1/proto/translation_service_pb2_grpc.py.
synthtool > Replaced "record delimiters are ':raw-latex:`\\\\n`' instead of\n          ':raw-latex:`\\\\r`:raw-latex:`\\\\n`'." in google/cloud/translate_v3beta1/proto/translation_service_pb2.py.
synthtool > Replaced '__doc__ = """Attributes:' in google/cloud/translate_v3beta1/proto/translation_service_pb2.py.
synthtool > Replaced 'This field has the same length as \\[``contents`\n\\s+`\\]\\[google\\.cloud\\.translation\\.v3beta1\\.TranslateTextRequest\\.conte\n\\s+nts\\]\\.' in google/cloud/translate_v3beta1/proto/translation_service_pb2.py.
.coveragerc
.flake8
MANIFEST.in
noxfile.py.j2
setup.cfg
Running session blacken
Creating virtual environment (virtualenv) using python3.6 in .nox/blacken
pip install black==19.3b0
black docs google tests noxfile.py setup.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/__init__.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/gapic/translation_service_client_config.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/gapic/transports/translation_service_grpc_transport.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/types.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/proto/translation_service_pb2_grpc.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/noxfile.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/gapic/translation_service_client.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/tests/unit/gapic/v3beta1/test_translation_service_client_v3beta1.py
reformatted /tmpfs/src/git/autosynth/working_repo/translate/google/cloud/translate_v3beta1/proto/translation_service_pb2.py
All done! ✨ 🍰 ✨
9 files reformatted, 16 files left unchanged.
Session blacken was successful.
synthtool > Cleaned up 3 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[busunkim96]

This change to make 'parent' required was unintended - a reversal should be coming soon via the generator.