Improve HttpConnection::translateDocument().
Fix sorting by size in WebUI when non-default locale used.
Merge pull request #1323 from glassez/webui_sort

Fix sorting by size in WebUI with Cyrillic languages
Modify configure script to support both Qt4 and Qt5 (also modify qconf project and modules to produce such script).
Add QHttp* classes dropped in Qt5.
Update QtSingleApplication.
Fix translations bundled with Qt.
Fix functions and macros using to support both Qt4 and Qt5.