Update signup-form.json

[alexrodba]

Corrected typos and style. Added missing translations. Added coherent style (tu vs vostè) across files.

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[cathysarisky]

Hi @alexrodba , thank you for these contributions. As I understand it, you're changing the formality of these translations, is that correct? From formal to informal? We've gone with informal (at least mostly) for languages with two formality levels, so that seems appropriate to me.

[alexrodba]

Hi @alexrodba , thank you for these contributions. As I understand it, you're changing the formality of these translations, is that correct? From formal to informal? We've gone with informal (at least mostly) for languages with two formality levels, so that seems appropriate to me.

Yes. Informal is the norm nowadays as even newspapers and government sites use it. Thanks for checking, though!