Change "XX Items in Stock" to "Only XX items left in stock"

Anyone knows how to change the “item(s)” language variable on the product page, so that it will say “Only XX item(s) left in stock”?

I changed it through the translation mode, but that influenced on other places where the word “item” appeared. So, I probably need to create a new language variable for this purpose but I don’t know in which template it goes.