Translations:Release notes 0.17/105/en


 * Fixes, code and other stuff
 * The unit tests suite for FEM work bench has been extended.
 * The code basis has been massively improved.
 * Most of FEM code has been ported to Python3.
 * Furthermore there have been tons of bugs found and fixed.
 * All icons have been nicely redrawn and in conjunction with guidelines.
 * Code formating There should be no more tabs and white spaces in all FEM source code.
 * Python code complies with most rules of flake8.
 * Dozens of typos inside source code have been fixed (AFAIK this applies to all FreeCAD, luzpaz finds all of them like finding a needle in the haystack).