Extra_english not working

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Hmm...maybe spaces in entry names are not allowed? Just a wild guess, but try changing "Stairway Door" to "StairwayDoor" both in the .lang file and in your ingame scripts.

Apart from that I don't see anything wrong...maybe you should post your ingame script too, just to be safe. Use the insert code button to make it easier to read and copy for others!