Change Somalia nationality translations to use Alpha2 code instead of Alpha3

[tumbledwyer]

Description

As part of moving Somalia from their fork to an official OpenCRVS release the functionality of some custom code had to be ported to the country config.

In packages/client/src/forms/register/mappings/query/field-mappings.ts, the function, countryAlpha3toAlpha2 was removed.

This affected nationalities printed on the certificate.

To fix this in the country config, change the translation file from using Alpha3 code to Alpha2

Acceptance criteria

GIVEN I create a declaration
WHEN I print the certificate
THEN I should see the correct nationality on the certificate

Dev tasks

• Convert nationality codes in client.csv from Alpha3 to Alpha2