fix: get autosynth working again

[bcoe]

Should get autosynth working again, I noticed a few issues that we will want to address in the upstream generator:

1. webpack.config.js generates with linting issues.
2. the system tests generate with the name translations rather than @google-cloud/translate.
3. the system tests have linting issues:

/usr/local/google/home/bencoe/google/nodejs-translate/system-test/fixtures/sample/src/index.js
  19:29  error  "@google-cloud/translate" is not found                                                            node/no-missing-require
  22:9   error  'translationServiceClient' is assigned a value but never used                                     no-unused-vars
  23:15  error  Replace `"translationServiceClient·was·created!"` with `'translationServiceClient·was·created!'`  prettier/prett

fixes #379

[codecov]

Codecov Report

Merging #387 into master will decrease coverage by 0.86%.
The diff coverage is 95.14%.

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
- Coverage   96.78%   95.92%   -0.87%     
==========================================
  Files           6        6              
  Lines        2706     3309     +603     
  Branches       66       76      +10     
==========================================
+ Hits         2619     3174     +555     
- Misses         84      134      +50     
+ Partials        3        1       -2

Impacted Files	Coverage Δ
src/v2/index.ts	99.5% <100%> (+0.02%)	⬆️
src/v3/translation_service_client.ts	92.7% <94.3%> (-0.93%)	⬇️

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[alexander-fenster]

re: system test name - will be taken care of by googleapis/gapic-generator-typescript#134 (we just need to give a hint to the generator about the package name to use).