Ajja

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- Refactor radio button template to use the same source API as object templates.

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- Fixed syntax error.

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- Suppress success messages in UI when saving all remaining fields.

- Add new template than renders a list of radio buttons.

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- Add some more translations.

- Disable placeholder for select fields which are required.

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- Unify node where form data is saved to.

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- Fix initialization of sources if form data is provided directly instead of
retrieving it via load url.

- Make sure that `after-load` always fires asynchonously.