You definitely want Confluence.
For workflows, you have a couple of options. Jira is a powerful issue tracker with a lot of features, and has fields and workflows as its core function. However, it is over-kill for a lot of cases, especially if your output is purely going to be confluence things. I'd consider a look at Trello (very simple boards with a workflow behind them) and, especially if you are *only* working with Confluence output, I'd look at Comalatech's workflows for Confluence - that would enable your users to remain within one tool.
Yes, Jira has Italian translations, there's a language pack for it you should be able to select in your profile (or globally to make it the default). See also https://confluence.atlassian.com/display/TRANS/Atlassian+Translations
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