Making the file dialogs translateable again.
Wrong place for those macros...

They already were in the header files...
Don't need this.
Removed unused variable.
Unified names for variables, "setup" instead of "prepare".
English.
Just to be sure...
Removed pointless condition.
Context menu for selecting specific tracks.
Override QListWidget::item(int) to fit with the theme of TrackWidget.

It only stores Tracks, after all.
Shorter is nicer.
Only create the context menu once and properly dispose of it.
Added "Switch selections" to the context menu.
Special slot for the special action.
Removed actionDelete_Track from MainWindow.

It belongs into the TrackWidget.
Whitespace.
Deleting tracks with the context menu :D
Removed unused #include.
Add the action to the list so the keyboard shortcut works.
Clear the track list from the context menu.

Though now it's awfully long.