Would you try just

defaults read .GlobalPreferences AppleLanguages

to see what you get? Even with the same settings as yours, I get

(
    "de-DE",
    "en-DE",
    "zh-Hant-TW"
)

and filtering this through the sed seems to do the right thing (Do you use the system sed or some other sed, e.g. from homebrew? What does which sed show?).

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