Add Latvian translation.

config-templates/config.php

dictionaries/admin.translation.json

dictionaries/attributes.translation.json

dictionaries/disco.translation.json

dictionaries/errors.translation.json

dictionaries/login.translation.json

dictionaries/logout.translation.json

dictionaries/status.translation.json

modules/aggregator/dictionaries/aggregator.translation.json

modules/authX509/dictionaries/X509error.translation.json

modules/authYubiKey/dictionaries/yubikey.translation.json

modules/authorize/dictionaries/Authorize.translation.json

modules/consent/dictionaries/consent.translation.json

...s/consentAdmin/dictionaries/consentadmin.translation.json

...pleAdmin/dictionaries/consentsimpleadmin.translation.json

modules/core/dictionaries/frontpage.translation.json

modules/core/dictionaries/no_cookie.translation.json

modules/core/dictionaries/no_metadata.translation.json

modules/core/dictionaries/no_state.translation.json

...les/core/dictionaries/short_sso_interval.translation.json