Translations:Compile on MinGW/7/en

If not already installed get a MinGW installer from the Sourceforge page at http://sourceforge.net/projects/mingw. When writing this tutorial the latest version was mingw-get-inst-20100831.exe. Download and just double-click the excutable. This installs the compiler and a minimal Windows developer environment. Make sure to also install the Fortran compiler because there is a single Fortran file in the 3rd party folder of the FreeCAD sources.