As its name implies, ForceLang is a plugin that lets you force a language, other than that of the system, for a specific game/application. This plugin works by hooking into sceAppUtilSystemParamGetInt and SCE_SYSTEM_PARAM_ID_LANG thus forging the language selection message passed to software.

http://wololo.net/2019/06/02/forcela...switch-psvita/