If you use different styles for UI elements, then you don't need to use additional words to indicate the UI element. So in @joaofn's example, you would use "Click Submit." Submit as the UI element is pretty clearly delineated.
As a sidenote, I've recently started at a new company. Wild West is an understatement. Much of the docs have been written by folks who are not necessarily well-trained in the sport of writing, well, quality docs. You can imagine my amusement (or maybe it was horror?) when I was sent a doc to review within the first couple of weeks of starting. All button elements were written as:
Click on the [NEXT] button to move to the next page.
Where [NEXT] was actually, I kid you not, a screen shot of, yup, the "Next" button. Which also meant the leading in the paragraph was all whack because the image threw the spacing off. And totally messed up the readability not to mention that if we did go out for localization you had the issue of two additional words ("the" and "button" to localize) plus every single image would have to be retaken.
Fortunately, he was amenable to redoing everything, and the next morning I had a brand new doc to read!