Translations:Release notes 0.18/47/en


 * New export Page to Dxf
 * new tutorial for TechDraw
 * improved dimension formatting for isometric views, angles, text location
 * improved error messages
 * improved section view formatting
 * allow custom line groups
 * additional preferences
 * easier edge & center mark selection
 * view direction based on current 3d view or selected face
 * added +/* tolerances to dimensions
 * new 3 point angle dimension
 * RMB context menu
 * keyboard zooming (Ctl+/-)
 * support for DMS dimensions