Pull Request: Add IE and GB as country options in OpenEMS

Hello all,

I have created a pull request to add Ireland and the United Kingdom as country options within OpenEMS. Currently there are only 6 countries allowed as options within the EMS - we are planning on launching OpenEMS based products in additional markets so I need to ensure the software supports this.

I have created a pull request here:
Add Ireland and UK as options in OpenEMS by thomasjbhayes · Pull Request #2504 · OpenEMS/openems (github.com)

Specifically I have modified the country.ts file for the UI as well as adding entries to the DE and EN i8n. I have also added the countries to the SafetyCountry enum within io.openems.edge.core.

Please let me know if I have missed anything important.