Upgrading Nokia Lumia 1020 to Windows 10 & Project Astoria questions

[Tourniquet]

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Regarding Language Packs: It's dependend on the FFU you have flashed on your phone. After you have the "final" Windows 10 Mobile Version you like (except the Astoria Builds, they only have limitied languages to choose from) and reset the phone you can select from a long list of preinstalled languages. If they don't include the language that you desire, I think you can also download the language pack from settings, with that I'm not too sure though.

What the language you're looking for?

If you have unencrypted Xap Files and enable developer settings in setting you can sideload Xap Files via a PC app. It's way easier to sideload Appx files because thats natively supported.