Cleanup: Remove unused CSS
Recover UI: Allow to filter by goal using dropdown
Recover UI: Only display the goals dropdown if the TP has goals
Alter add_project_goals to work with richer phaselist files

This way we can specify the required data in a file and just import it,
instead of having to type each bit of in different forms.

This helps to minimize the current lack of working method to edit goals.
Recover UI: Redirect to TP root if current resource isn't in chosen goal

This avoids showing the current resource when we change the goal in the
dropdown but the current resource doesn't belong to the chosen goal.
Followup: Remove goals statistics table

We now have enough with the next most important goal translate action
and the prioritized goals dropdown.

This also includes some minor cleanups after previous work on
redirecting to TP root if current resource doesn't belong to chosen goal.
Recover UI: Make goal filtered table display all the data
Recover: Display actions in a sidebar

The actions sidebar is collapsed by default to make the users adjust to the
fact that we are going to remove this in a future.

If several sidebars are shown then some tabs are displayed to allow users
switch the sidebar.

Extension actions might not work properly.
Recover: Display current goal data in sidebar
Recover: Display instructions in sidebar

This is a temporary recover until we manage to get this blended into
staticpages.

Includes extensive changes to support editing two forms at the same in
the sidebar, because it is now possible to have a form for editing the
instructions and another one for editing a goal.