Text must be "on"/"off", but not "true"/"false"

In "Create new world"->"Game rules" text on mouse enter to toggle button is

(game rule name)

        Default: true(or "false")

But on toggle button text is "on"(or "off")

What I expected to happen was...:
Text must be "on"(or "off")

What actually happened was...:
Text is "true"(or "false")

Steps to Reproduce:
1. Go to "Create new world"
2. Go to "Game rules"
3. Enter mouse to any button to toggle gamerule                                                                            4. Text is "true"(or "false")