centrar punto de inserción - command description

Command centers insert point of selected block. Options:
1. Center in X axis
2. Center in Y axis
3. Center in both axises (XY or MC)
4. Insertion point in corner (TL - top left, TR - top right, BL - bottom left, BR - bottom right)
5. Insertion point in middle of the edge (TC - top center, ML - middle left, MR - middle right, BC - bottom center)