Show the loaded torrents in the transferlist when qBT is launched with a torrent/magnet and the AddNewTorrentDialog is showing. Closes #1564.

Conflicts:
	src/mainwindow.cpp
When qBT is launched with a magnet don't show it in the transferlist while the metadata are being loaded in the background.
Show disk space while retrieving metadata. Closes #1693.
Sync translations from Transifex and run lupdate.