`Duration.toHuman` throws RangeError when Duration uses `quarters`

Describe the bug When using the toHuman() method on any Duration that has the quarters property set, the error RangeError: Invalid unit argument for Intl.NumberFormat() 'quarter' is thrown.

To Reproduce

var luxon = require("luxon")

const dur = luxon.Duration.fromObject({quarters: 1});

console.log(dur.toHuman())

Link to RunKit: https://runkit.com/luca-audoora/luxon-quarters

Actual vs Expected behavior I expected to get the string "1 quarter" back, above error is thrown instead.

Desktop (please complete the following information):

• OS: macOS 14.1.1 (23B81)
• Browser: Firefox 119.0.1 (64-Bit)
• Luxon version 3.4.3
• Your timezone "Europe/Berlin"