[Bug]: When a string doesn't exist in a language in second level

[eddsaura]

Description of the bug

Default translate doesn't work properly when the translation json has more than one level. i.e

// form.json

{
    "fishbowl": {
        "title": "Title",
        "day": "Date",
        "selectDay": "Select day",
        "time": "Starts at"
    }
}

Definition of the solution

The logic should check everylevel, independently.

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