Changes:
- Wrapped upload section in a styled fieldset with legend
- Adjusted spacing and layout for better visual hierarchy
- Updated translations:
- Added "upload-proof-of-payment-legend" key
- English: "Proof of payment"
- Croatian: "Potvrda o uplati"
- Updated label text to be more descriptive
- English: "Here you can upload proof of payment:"
- Croatian: "Ovdje možete priložiti potvrdu o uplati:"
The upload section now has a consistent fieldset styling
matching other sections of the form.
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Co-Authored-By: Claude <noreply@anthropic.com>
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