-'dropdown.this_day' => 'vandaag',
-'dropdown.last_day' => 'gisteren',
-'dropdown.this_week' => 'deze week',
-'dropdown.last_week' => 'vorige week',
-'dropdown.this_month' => 'deze maand',
-'dropdown.last_month' => 'vorige maand',
-'dropdown.this_year' => 'dit jaar',
+'dropdown.current_day' => 'vandaag',
+'dropdown.previous_day' => 'gisteren',
+'dropdown.selected_day' => 'dag',
+'dropdown.current_week' => 'deze week',
+'dropdown.previous_week' => 'vorige week',
+'dropdown.selected_week' => 'week',
+'dropdown.current_month' => 'deze maand',
+'dropdown.previous_month' => 'vorige maand',
+'dropdown.selected_month' => 'maand',
+'dropdown.current_year' => 'dit jaar',
+// TODO: translate the following.
+// 'dropdown.previous_year' => 'previous year',
+'dropdown.selected_year' => 'jaar',