In my 2017.3.1 demo DB, the translations are working for the Save and Submit and Cancel options. See below:
Ivanti actually has a Problem record logged to development for the "Save for Later" button not translating. I would suggest opening a Case with Ivanti ISM Support if for nothing else to add another linked Case to up the priority of the existing Problem logged for the "Save for Later" button.
Thanks Scott for your answer. We will open another support ticket with Ivanti.