Translations:Release notes 0.21/77/en


 * In the Hole dialog, the deprecated screw head types (cheese head, cap screw etc.) have been removed. They were deprecated since FreeCAD 0.19. Holes using these types are transformed to custom countersinks/counterbore holes with the diameter and depth used by the types. Pull request #7654
 * In the Additive Loft and Subtractive Loft dialogs, the previously non-functional option Closed does now create a closed loft (like a ring). Pull request #8748
 * The Validate sketch command was added to Helper toolbar. Pull request #7700
 * The unusable Leave sketch and View sketch commands were removed from the menu. The Edit sketch, Merge sketches and Mirror sketch commands were added to the menu. Pull request #7700
 * The involute gear profile has new properties to change the tooth length. This now allows adjustments for certain types of interferences and to use the profile to create involute splines too. Pull request #8184
 * The involute gear profile now offers profile shifting. Issue #5618 and Pull request #8934