Import proposals from spreadsheet

It is very common that municipalities still collect ideas on paper, as unfortunate as it is in a digital era. Not everyone has the necessary digital skills to use Decidim and some people are concerned about entering their personal details to any digital system. Therefore, admin users want to bulk import paper collected ideas to Decidim. The import document should contain the following columns: - Proposal title - Proposal body - Proposal category ID - Proposal scope ID The import should work per component and the proposals should be imported to that component. Similarly to the participatory texts, the admin user should be shown a preview of the proposals to be imported before actually importing them. The admin user should be able to also define under which user these proposals are imported to similarly as it is possible to select for normal proposals (his/her personal name or a group he/she belongs to). This feature should be an admin feature available under the proposals admin panel.