Why do I see the "Language Resources" item rather than "Auto-substitution" for "Translation Memory and Automated Translation" for Studio 2017 SR1?
This means I have no means of customising the auto-substition
You are currently working on UAT
Why do I see the "Language Resources" item rather than "Auto-substitution" for "Translation Memory and Automated Translation" for Studio 2017 SR1?
This means I have no means of customising the auto-substition
Most likely because you are not looking at the specific language pair:

Paul Filkin | RWS
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Thanks Paul. Sometimes the answer is so "obvious".