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upgrading fleet paradox
Upgrade button is active and clickable even if your ships are up to date, but you have at least one captured ship that is higher tech than yours, clicking it will then downgrade this ship(s) to your tech. 'Detouch outdated ships' button stays grayed out.
add info that norse have modifier for +10% naval force limit 21:28, 14 June 2015 (CEST)