In the official wallet, the mnemonic seed comprises 25 words with the last word being used as a checksum. Those words correspond to a 256-bit integer, which is the account's *private* @spend-key. The *private* @view-key is derived by hashing the private spend key with Keccak-256, producing a second 256-bit integer. The corresponding *public* keys are then derived from the private keys.
It's not a good idea to store more than you want to lose in a "hot wallet" aka a wallet which is currently or has ever been connected to the internet or loaded onto any device that has or may in the future be connected to the internet or any untrusted source!
English words MUST be kept as is and translations added after them. Example: ["account", "accounts", "wallet", "wallets", "conto", "conti", "portafoglio", "portafogli"]