You are certainly right. These setting must not be translated here.
In the code, I think its in src/plugins/contrib/wxSmith/wxwidgets/wxsnewwindowdlg.cpp at lines 210, 212 or 214, they are initialized with the macro _, which means they can be translated, which is normal if it's used only to identify a button or something else to be displayed in the graphic user interface. Obviously, it's also used to generate code, and of course, it must not be translated. The author of this plugin should probably use here the macro _T and not _.
In the next French version, I will correct this (in fact do a workaround), simply by duplicating the English words in the French translation.
Thanks for having pointed this problem.
gd_on