Yes, Dynamics NAV supports multiple languages. It typically comes in your local language(s) and English, and then you can download and install additional languages. Keep in mind that modifications and add-ons then have to be translated (which there is tools that you could use to help you).
Yes, you can create as many companies as you want in each database. Typically you create a company per legal entity and maybe some consolidation companies. And of course, test companies. Companies within a database share the same functionality but the data is separated.
Dynamics NAV comes with object level permissions. You can setup what objects (tables, reports, pages, etc.) each user has access to and specify if the data can be inserted, modified or deleted. If you want to control permissions down to a field level (e.g. who is allowed to alter what field) then you need to get an add-on for this (which there are many to choose from) or develop something yourself (which is quite easy). The same goes with if you want to control what user that is allowed to post onto what g/l account, location code, item, bin, etc…
The Dynamics NAV licensed users are concurrent users, meaning that you can have as many named users as you want but the license only allows a certain number of them to be connected at the same time.
Kind of the same answer as how much it cost, it all depends on the requirements. But count on everything from 3 months to 12 months. My average Dynamics NAV implementation that includes manufacturing is something like 9 months.
Dynamics NAV as standard does not comply with FDAs regulations on electronic records and electronic signatures. But there are multiple add-ons that will make it possible to comply with this. Although it is important to know that software alone is not sufficient to comply with Part 11, you also need procedural controls (like training, SOPs, etc.) and certain administrative controls.
How much is a car? 🙂 The question about how much it cost is impossible to answer without knowing what is required. It can be fairly inexpensive but it can also be quite expensive. There is a software portion that includes the licenses to Microsoft and for potential add-ons, and there is a consulting portion that includes tasks like training, configuration, data migration and development. There is also typically a large amount of work you internal people have to put into the implementation. Contact a partner to do an analysis and estimate if you want to know how much it...