en translation fix for ReviewForm.reviewRatingRequired

[Schwerbelastung]

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[lyyder]

It seems that this message is never visible, which is probably why it's been wrong all along. It's used in the ReviewForm component and I don't think the submit button for the form is enabled before the rating value is provided. And there is now way to focus the review start input and then leave it empty, which would render this message.

A sidenote/question: Is the fact that the FieldReviewRating component can't be navigated into with TAB an accessibility issue and/or does it make the component inconsistent in regard to other input fields?

[Gnito]

@lyyder, yeah. It is an accessibility problem. There should be tabindex=0 in the <label> elements + some keyboard listener attached to them too. (It's just hard to find good time to fix this.)

What comes to an error message: our template app doesn't need it but it's good to have error handling ready in every Field* input.

[Schwerbelastung]

And it's one less mistake that any outsider can find in our code :)