you can test it easily by incorporating the file into the emulator's files.
when you're done editing your language file, using 7zip go to the bin folder and open jpcsp.jar (jars can be opened and modified through 7zip easily). then go to the jpcsp/languages folder and simply copy+paste/move the edited file into the archive.
it'll update the file and on the next run the emulator will load your edited translation file.
when you're done editing your language file, using 7zip go to the bin folder and open jpcsp.jar (jars can be opened and modified through 7zip easily). then go to the jpcsp/languages folder and simply copy+paste/move the edited file into the archive.
it'll update the file and on the next run the emulator will load your edited translation file.