i believe u are intended to get english translated in playing kRO official server i guess?
well.. i don't think kRO clients can be patch with Nemo as those clients are not yet unpacked. and if they are able to do so, u need to patch the kRO clients with nemo patcher weekly as gravity will update the kRO clients weekly. that is the first point.
2nd point, i'm not sure about changing the lua / lub files in the grf will get things works as u plan..
i believe u already made attempt to do so but seems everything just went broke up, right? i don't think it is best choice to replace lua / lub files in the data.grf & rdata.grf with english translated files... FYI, even in private server, it is best to create another grf that contain the english translated lub files which leaves the data.grf & rdata.grf untouchable.. u can set the the grf read sequence order in file name DATA.INI & make it read the english translated grf first before it read data.grf / rdata.grf