improve ui

assets/translations/en.json

assets/translations/es.json

assets/translations/fr.json

lib/models/wallet_data.dart

lib/providers/substrate_sdk.dart

lib/screens/myWallets/wallet_options.dart

lib/screens/myWallets/wallets_home.dart

lib/widgets/balance.dart

lib/widgets/bottom_app_bar.dart

lib/widgets/buttons/add_new_derivation_button.dart

lib/widgets/commons/common_elements.dart

lib/widgets/idty_status.dart

lib/widgets/wallet_tile.dart

lib/widgets/wallet_tile_membre.dart