#1795 Add Basque machine translation engines

[Andoni Rey Ortiz]

It would be great to have some machine translation engine running from inside OmegaT. I have no idea of how to add them, but these are the three available:

• https://www.euskadi.eus/itzuli/
• https://elia.eus/itzultzailea (info@elia.eus)
• https://www.batua.eus/ (https://itzuli.vicomtech.org/en/api/)