OK think you are editing the correct files - but there is an issue with the Roman interface not being read from unpacked version.. see these posts

https://forums.totalwar.org/vb/showthread.php?t=42918

https://forums.totalwar.org/vb/showp...1&postcount=30

according to me at end of first thread it did work from mod-folder without re-packing / mod_0.pak
though I could always have been doing something stupid like testing with BI exe...
are you using mod-folder?