prefer console.error messages for errors

src/views/ImportAccountView.vue

@@ -93,8 +93,7 @@ export default class ImportAccountView extends Vue {
         });
         this.$router.push({ name: "account" });
       } catch (err) {
-        console.log("Error!");
-        console.log(err);
+        console.error("Error saving mnemonic & updating settings:", err);
       }
     }
   }