Here are the translations of the “System” page of the main website as of June 1st, 2015. If there are any updates, they will be posted here. It is a rather tall image as it was put together with various screen shots.
This was all done on my free time, and so took a little while. It was certainly a lot of work, but I do hope you enjoy! I am unemployed… so please consider donating if you like the work I do. : )
UPDATE: While the wording on the website regarding Amiibo was vague, the Nintendo Direct confirmed that you do recruit the character after you beat them in the fight. So that means Marth/Ike/Robin/Lucina can be unlocked by beating them in a fight.