legacy: replace load_device mnemonic to mnemonics

legacy/firmware/config.c

@@ -503,9 +503,9 @@ void config_loadDevice(const LoadDevice *msg) {
   if (msg->has_node) {
     storage_delete(KEY_MNEMONIC);
     config_setNode(&(msg->node));
-  } else if (msg->has_mnemonic) {
+  } else if (msg->mnemonics_count) {
     storage_delete(KEY_NODE);
-    config_setMnemonic(msg->mnemonic);
+    config_setMnemonic(msg->mnemonics[0]);
   }
 
   if (msg->has_language) {

legacy/firmware/fsm_msg_common.h

@@ -213,8 +213,8 @@ void fsm_msgLoadDevice(const LoadDevice *msg) {
     return;
   }
 
-  if (msg->has_mnemonic && !(msg->has_skip_checksum && msg->skip_checksum)) {
+  if (msg->mnemonics_count && !(msg->has_skip_checksum && msg->skip_checksum)) {
-    if (!mnemonic_check(msg->mnemonic)) {
+    if (!mnemonic_check(msg->mnemonics[0])) {
       fsm_sendFailure(FailureType_Failure_DataError,
                       _("Mnemonic with wrong checksum provided"));
       layoutHome();

legacy/firmware/protob/messages-management.options

@@ -16,7 +16,7 @@ ApplySettings.homescreen                max_size:1024
 
 Ping.message                            max_size:256
 
-LoadDevice.mnemonic                     max_size:241
+LoadDevice.mnemonics                    max_count:16 max_size:241
 LoadDevice.pin                          max_size:10
 LoadDevice.language                     max_size:17
 LoadDevice.label                        max_size:33