Translations:Sketcher helper constraint/3/en

Helper constraints are added automatically when they are needed. The decision for if they are needed is currently made by evaluating the helper constraint error for current state of geometry (this may change in future versions). If the error is small enough, the constraint is considered to be unnecessary, and is not added. In some cases, this logic can lead to errors (the constraint can be satisfied by accident, which can easily happen when Sketcher Grid Snapping is on).