+ (NSString *)mj_localizedStringForKey:(NSString *)key value:(NSString *)value 方法中NSString *i18nFolderPath = [bundle pathForResource:language ofType:@"lproj"];获取到的i18nFolderPath为nil,导致mj_defaultI18nBundle = [NSBundle bundleWithPath:i18nFolderPath];执行有异常提示: NSBundle (null) initWithPath failed because the resolved path is empty or nil