[DX] Save Dev time, make a console notice for Backdrop.behaviours

Lots of folks have their computer language set to British English, and their editors autocomplete Backdrop.behaviors to Backdrop.behaviours this can cause a lot of frustration and time lost.

Log a notice to the console like: Sorry for our "behavior". -American ubiquity

Alternatively, Less "funny": Backdrop uses American spelling, for example in Backdrop.behaviors

Credit: justafish