Translations:Release notes 0.16/1/en

From FreeCAD Documentation

FreeCAD 0.16 was released on 18. April, 2016, get it from GitHub. This is a summary of the most interesting changes. The complete list of changes can be found in the Mantis changelog. Older versions at: 0.15 - 0.14 - 0.13 - 0.12 - 0.11