[Expo] (Zoom) Handle change of active workspace.
[Expo] Ctrl+Mouse-wheel up/down zooms in/out.
[Expo] Fewer zoom steps when zooming out.
[Window Manager] (window-alert notifications) Fix error in translation support.
[Connector] Code review

1) Rename makeConnection -> connect
2) Add a return value to Connector.addConnection
3) A few minor additional changes.
[Expo] Even fewer steps when zooming out.
[Expo] Make thumbweel-scroll zoom smoother.
[Expo] Better handling of when a zoomed-in workspace is deleted.