Add ability to toggle between progress bar and detailed stats on the dashboard

[mathjazz]

Pontoon dashboards show the progress bar for each project, locale, resource or tag, and reveal detailed stats on hover. Sometimes it would be more convenient to show the detailed stats for all entries in the table at the same time, e.g. when trying to find all localizations that contain warnings.

Let's add a toggle to switch between progress bar and detailed stats for all entries in the table.