Code development platform for open source projects from the European Union institutions

Allow level 2 NUTS codes for place of performance

@scmarcc @dudaszs cc @nratmira As discussed during the BE workshop yesterday, we are very much in favour of allowing level 2 NUTS codes in BG-708 / BT-5071.

For further information about the platform and support, please see https://code.europa.eu/info/about