Internationalize the "Unassigned" group name.
lupdate all the localizations
Strip sound files extension when index .zips, like in sound dirs (issue #173)
Update Russian translation
Fixed Issue #184: F3 and Shift-F3 shortcuts don't work in a scan popup window when Search is activated

Also fixed  #185: Dictionaries menu uses hardcoded shortcut value in its text.
lupdate all the localizations
Updated Russian localization ("Dictionaries..." and F3).