Girlfriend is the same as "flickvän" in Swedish.
flickvän
To say you're in a relationship you say "Jag är i ett förhållande." Or you could say you already have a boyfriend/girlfriend: "Jag har redan en pojkvän/flickvän."
And is "och" in swedish.
På svenska
"King" in Swedish is "kung".
Vill du bli min flickvän.
Suedoise is French for Swedish.
Equality is "jämlikhet" in Swedish.
"Goal" in Swedish is "mål".
Cup is kopp in Swedish.
Spaceship is rymdskepp in Swedish.
Judge is domare in Swedish.