How to reorder items in FormGroup?

I have element in a FormGroup, let say

const langs = ['en', 'de']
form = new FormGroup({
languages: [langs, [Validators.required]]
descriptions: initChildGroup(langs)
})

initChildGroup(langs) {
const formGroup: FormGroup = new FormGroup({})

langs.forEach((lang, index) => {
formGroup.addControl(lang, new FormControl())
}
}


I now want to move the order of the lang and put 'de' first.
Moving element in an array is quite an easy task, but how to handle this properly with a FormGroup ?

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