Merge gcompris_qt.po translation update from several files
Merge gcompris_qt.po translation update from several files:
sugg-alexsmirnoff-04jun2015/gcompris_qt.po sugg-alexsmirnov-02aug2015/gcompris_qt.po sugg-alexsmirnov-12aug2015/gcompris_qt-new.po sugg-alexsmirnov-15nov2015/gcompris_qt.po sugg-alexsmirnov-01dec2015/gcompris_qt.po sugg-ibiz-21jan2017/gcompris_qt.po sugg-ibiz-06aug2017/gcompris_qt.po
(received over e-mail from Alexander Smirnov in 2015 and from Ilya Bizyaev in 2017)