Fix missing percent sign in stats dialog
Don't show a popup menu when no torrent is selected.
Launch external programs async and don't block. Closes #1252.
Don't re-announce to trackers when torrent is paused. Closes #1310.

Conflicts:
	src/properties/trackerlist.cpp
Bring dialog boxes in the front when qbt doesn't have focus.

Code inspired by glassez patch.
Correctly resize 'name' column of the content tab. Closes #1360.
Reuse code in AddNewTorrentDialog. #894.

Conflicts:
	src/addnewtorrentdialog.cpp
Correctly restore 'name' column width when loading magnet links in the 'Add new torrent dialog'. Closes #1334.
Fix WebUI sort by size/speed for some locales (with comma as decimal point).
Fix WebUI sort by ratio for some locales (with comma as decimal point).
Sync translations from Transifex.
Update Changelog.
Bump to 3.1.6
Fix build of v3.1.6
Update Changelog.
Bump to 3.1.7
Revert "Fix build of v3.1.6"

This reverts commit b294d89b4f7ea94073cf0e52f93d00fe5a7fb35b.
Really fix build of v3.1.6
Update Changelog.
Bump to 3.1.8