Below is a sample of a language definition file for config.exe, with some comments provided.
language = English
// Window title
title = Re:Dnh Configuration Utility (English)
// Tab names
title.general = General
title.input = Input
// Main Button Names
main.button.cancel = Cancel
main.button.saveandclose = Save && Close
main.button.saveandlaunch = Save && Launch
// ----------------------------------------------------------------------------
// General Tab
// ----------------------------------------------------------------------------
// Group Names
general.display = Display
general.graphics = Graphics
general.option = Option
// Display Group
general.display.screenmode = Screen Mode
general.display.screenmode.fullscreen = Fullscreen
general.display.screenmode.window = Windowed
general.display.windowsize = Window Size
general.display.vsync = Enable vertical sync
general.display.borderless = Enable borderless windowed fullscreen
general.display.integerscale = Use integer scaling for borderless window (DOT by DOT)
// Graphics Group
general.graphics.frameskip = Frameskip
general.graphics.frameskip.full = None (Recommended)
general.graphics.frameskip.half = 1/2
general.graphics.frameskip.third = 1/3
general.graphics.frameskip.auto = Automatic
general.graphics.antialiasing = Anti-aliasing
general.graphics.antialiasing.none = None
// Option Group
general.option.showlogwindow = Show log window
general.option.savelogfile = Save log file
general.option.hidemouse = Hide mouse cursor
// ----------------------------------------------------------------------------
// Input Tab
// ----------------------------------------------------------------------------
input.paddevice = Gamepad Device
input.button.refresh = Refresh Devices
input.paddeadzone = Joystick Deadzone
input.list.action = Action
input.list.keyboard = Keyboard
input.list.pad = Pad
// Action Names
input.list.action.left = Left
input.list.action.right = Right
input.list.action.up = Up
input.list.action.down = Down
input.list.action.accept = Accept
input.list.action.cancel = Cancel
input.list.action.shot = Shot
input.list.action.bomb = Bomb
input.list.action.slow = Slow
input.list.action.user1 = User1
input.list.action.user2 = User2
input.list.action.pause = Pause