The resource files I specified in my post on November 27 is all there is. So, no "zh-Hant" culture. Now, there are ways of localizing a report, see this article, the fact that you are using an internal function, I do not see any way of translating / localizing that.
Best you can do is suggest the addition of this localization in the SAP Idea Place and then hold your breath...
- Ludek