Well, in a fire, the curtains could prevent the spread of water in a way in which it was designed, therefore a fire inspector might have an issue with it.
With this being said, that looks like a really stupid place for a sprinkler head.
Is this a brand new property? If so, maybe you could call the fire inspector and ask him to come look at it and give you some suggestions. It's possible that he/she could get the sprinkler crew to come back and move it so that you could install curtains.
Or you could talk to your land lord to see if they might be willing to pay to have it moved, since it was obviously installed stupidly and it isn't your fault.
Good luck!
With this being said, that looks like a really stupid place for a sprinkler head.
Is this a brand new property? If so, maybe you could call the fire inspector and ask him to come look at it and give you some suggestions. It's possible that he/she could get the sprinkler crew to come back and move it so that you could install curtains.
Or you could talk to your land lord to see if they might be willing to pay to have it moved, since it was obviously installed stupidly and it isn't your fault.
Good luck!