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I am English and fully understand what the OP meant.
Why did you find the need to translate into English and not Spanish or German or any other language?
While I agree with some points in your post it just makes you come across as either extremely stupid or a bit of a prick.
If anything the Op is correct as this is an American website.
Also spelt and spelled are both English words(though spelled is the least commonly used version in the English language) and mean the same thing, just like burned and burnt!

Just because you're
paranoid it doesn't
mean that they're
not watching.

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Really? Do you genuinely think any reader of English requires such a 'translation'? Why aren't you clarifying the use of 'teacher', 'student', 'college'
I also question the accuracy of the translation. In Britain you visit a draper's shop to buy curtains you do not go to a curtain maker's. No reader of British English is likely to not know what drapes are.
Then again, perhaps the translation is offered on the grounds of class or age rather than Atlanticism. The lower classes and yoof clearly only encounter curtains pre-cut and shrink-wrapped in their edge-of-town malls and it is horribly elitest of me to expect them to have sauntered by a haberdasher or drapery.

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They were PVC welding strip. It protects against welding flash by filtering out harmful UV rays.
It is approved to EN1598 by DIN CERTCO in Germany, the International Standards Agency for products of this type. It is self-extinguishing within 1 second, thus eliminating the danger of fire from welding sparks.
At least that's what it says here:
http://www.globalpvcsolutions.co.uk/index.php?cPath=23

It is metal work and the drapes are used to contain the sparks, its a collage, not a secondary school, collages use these drapes for a lot of different lessons that involve flying debris

thats because it was filmed at a sixth form collage in cambridge rather than a school in london.

i think they looked more like drapes used in photography departments to shield of light so u can develop ur film. i know it was in the woodworks section but it just makes more sense.

I thought that, and that it would work at college level, but I can't imagine that a secondary school class being closeted off in pairs hidden out of sight of the teacher is a sensible idea!

I wondered this myself while watching that scene.
The teacher that was killed behind the black plastic drapes appeared to me in a metalwork area and was killed by some welding equipment, hence the sparks
My guess is that the drapes are there as eye protection for those passing without the need to wear a welders mask all the time?