This thread is resolved. Here is a description of the problem and solution.
Problem: When a user logs in using Ultimate Member in a secondary language, the user is not directed to the correctly translated login url.
Solution: Add the following admin texts to the String Translation table and translate them: um_cached_role_member - auto_approve_url - login_redirect_url - logout_redirect_url
You can do this by going to WPML > String Translation and scroll down to the bottom of the page and click on the link "Translate texts in admin screens »". Then, scroll through that page and see if you find the the string. If so, tick the checkbox and click Apply to add it to the String Translation table. Now you can go back to WPML > String Translation and you should see the string added there.
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