@bcampbel , Brian, It appears the ability to change the language setting on Vtech Kidizoom Smart Watch DX model has been removed. Find the manual below. Just a thought, I put the link to vtech support also, maybe they do have a way to change the language and accidentally omitted it, would not hurt to ask. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
https://www.vtechkids.com/assets/data/products/%7B055540F3-B63F-4FF1-AE61-04316A7A032A%7D/manuals/171600_KidizoomSmartwatchDX_ProductManual_05.20.15(2015)_FINAL.pdf
https://www.vtechkids.com/support#contact_us