Hi Omilcent! 

Happy to help here! We can use the “Batch Update” feature in a campaign to take these steps! More about using the Batch Update feature here. 

In this instance we can create a campaign and use the “Batch Update” action: 

From here we can select the update profile attribute action: 

Then you will want to select your attribute name and enter the new value you want it to update to! And that’s it! :) 

Additionally, for enrolling those individuals, you can create a segment that looks for anyone with those values for the “preferred-languages” attribute. You can then use that segment as the enrollment criteria for the workflow! Let me know if this helps :)