Michael is right, you could give the transliteration and then the translation in brackets. I prefer this translation marginally over Michael's as being more literal. On Google I found, e.g. Boston Window Designs, Vinyl Window Designs Ltd., Window Designs by Gail, Enjo Custom Window Designs, and many more companies with 'window designs' in their name. In view of this, I would boldly dispense with the transliteration unless you are feeling particularly cautious.

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