I have looked into the issue and have an answer for those of you who are artists but do not seem to have access to the language dropdowns. You aren't considered a TS artist as soon as you publish something. You need to have payment information in your account for our database to consider you a full artist with different privileges on the site.
So, please update your accounts with payment receipt info (how you will be paid if someone purchases your work), and you should receive access from time to time.
Turbosquid occasionally releases new features to artists only ahead of the public, so there is great value in having this access. We love it when we receive constructive feedback from our community about updates, whether it is good or bad.
Jonathon Graas, Localization Editor