Import settings not works with unicode (IDN)

[SCmkQrK1NhwcWoPJF3FImaqHnG2PqPLWBt2GtSU]

Steps to reproduce:

1. Create a new Firefox profile
2. Set RP's v0.5 default policy to: "deny"
3. Clear all RP's rules.
4. Open page http://5элемент.бел
5. Add allow rule http://5элемент.бел to http://5element.by
6. Export RP's rules to file.
7. Clear all RP's rules.
8. Import RP's rules from file from step 6.

What happens?

Rule address will be corrupt. Rule from step 5 not works.

What should happen?

Settings after step 5 and after step 8 must be equivalent.

Please, use encoding UTF-8 with BOM when import and export.