Task updates from 17th to 19th March

- Have a list of migrated phone numbers from the .csv files

- Set flags based on the migrated account data

- Set language code based on the current language

- nostr:npub1qzm8h2pse59hzvhxdv8ec6ch0gevnzjnltp40ardm5stljht5wyqjlj4lf added Engine exec to the migration script for the persister

Progress can be followed on https://git.grassecon.net/grassrootseconomics/sarafu-ussd-instance/pulls/4