Translations:Compile on MinGW/49/en

Warning: the following is obsoleted from version 0.14, since FreeCAD is now using pySide instead of PyQt. At the moment, PySide suport for MingW seems still not complete: https://bugreports.qt-project.org/browse/PYSIDE-113?page=com.atlassian.jira.plugin.system.issuetabpanels%3aall-tabpanel