Two thoughts, either in a language definition file or in the code that generates the information for the drop down. Do a search for Qty in your files from the admin panel. Try to identify where that is used: if there is a define statement with a word in all caps, search on the all caps word, otherwise open the code that uses the phrase specifically and should be able to follow where the html code gets put around the word if it not right where you found the phrase.
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