The original DG1022 also only had support for two language, Chinese and Chinglish.
If I didn't lose count, then the DG1022U is at least the fourth hardware revision. DG1022 ver. 1 hardware, DG1022 ver. 2 hardware (a silent, incompatible update), DG1022A (slightly higher frequency), and now the DG1022U. Since there were some incompatibilities in the past I wouldn't assume the U is a 100% replacement.