In Anglish, "true" and "false" will show as "yay" and "nay"

What I expected to happen was...:
When there's an exception when entering a command, I expect to see:
"Unright boolean, expected 'true' or 'false' but found 'nay'"

What actually happened was...:
The "right" booleans provided were "yay" and "nay", when those aren't even proper booleans.

example: "Unright boolean, expected 'yay' or 'nay' but found 'nay'"

Steps to Reproduce:
1. Set language to Anglish (Foroned Kingdom)
2. Type "/gamerule doFireTick yay"
3. Observe exception