Merge branch 'account-number'

Author: Beerosagos

backup.html

@@ -62,10 +62,7 @@ <h4>Coin_type level</h4>
 
         <h4>Account level</h4>
         <p>
-          The BitBoxApp currently only supports a single account.
-          Therefore, wallets created with the BitBoxApp will use 0 for the account.
-          Wallets created with other wallet software can have a different account number.
-          The firmware of the BitBox02 limits the account number to 99, allowing at most 100 accounts.
+          The first account is identified with 0. The firmware of the BitBox02 limits the account number to 99, allowing at most 100 accounts.
         </p>
 
         <h4>Change level</h4>