i18next / react-i18next / 39999477086

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fix(Trans): fall back to the last key of an i18nKey array, like t() (#1941)

With an array of fallback keys and no children, Trans used the array
itself as defaultValue. When none of the keys had a translation,
i18next handled that default as an object, so Trans rendered
"key 'crm_item_created (en)' returned an object instead of string."
where t() with the same keys returns the last key, "crm_item_created".
An array of selectors had the same problem.

Trans now falls back to the last key of the array, resolved with
keyFromSelector when it is a selector, and still passes a string
defaultValue to t().

Signed-off-by: nk-batman21 <viet_vip_kute@yahoo.com>

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