SMT vs NMT option in Google MT connector

[ysavourel]

It might be useful to have a new option for the Google MT connector: To be able to choose between the NMT or the SMT engine.

This is driven by the model parameter (See https://cloud.google.com/translate/docs/reference/translate#body.QUERY_PARAMETERS.model) and currently the default is to use NMT.

[Chase Tingley]

Fix issue #635 - Add flag to force PBMT usage in Google MT connector

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