WUI: Fallback to english on registration form
Created by: zlamalp
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If form item doesn't have properties for specific locale, it showed wrong form (fallback to labels, empty help or error messages).
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Now for cases when localized property is null or empty we fallback to "en" lang and return it instead.
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If its still null or empty, we fallback to previous solutions.
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This helps instances with a single language, since if user accessed them with locale supported by our GUI, it draw wrong form. Now it falls back to English.