At least an important step is made. The actual text is highly mathematical in nature. This work will be translated in English later. Please check with the author for availability by that time. The methods seek to reproduce the working of the sundial from the measurements given in the available data.
Some methods are very sensitive to small errors in measured data.
Others are less so, but in some cases the needed angle or length was measured quite inaccurately. In many cases the author was able to establish that the sundial under scrutiny was actually quite good. A figure showing the dial plate of a moon dial. Anyone actually using it in earnest should have to be at least a little conversant with the language anyway.