fix `Array to string conversion' error in opI18N (fixes #3424)
fix `Array to string conversion' error in opI18N (fixes #3424)

ShinichiU/OpenPNE3,isaosano/OpenPNE3,isaosano/OpenPNE3,C-nakajima/OpenPNE3,ShinichiU/OpenPNE3,C-nakajima/OpenPNE3,isaosano/OpenPNE3,C-nakajima/OpenPNE3,nishizoe/OpenPNE3,nishizoe/OpenPNE3,C-nakajima/OpenPNE3,ShinichiU/OpenPNE3,ShinichiU/OpenPNE3,isaosano/OpenPNE3