-// TODO: check translation of dropdown.this_day. It does not necessarily means "today". It means a specific ("this") day selected on calendar. See charts.php.
-// 'dropdown.this_day' => 'امروز',
-// 'dropdown.last_day' => 'last day',
-'dropdown.this_week' => 'هفته جاری',
-'dropdown.last_week' => 'هفته آخر',
-'dropdown.this_month' => 'ماه جاری',
-'dropdown.last_month' => 'ماه آخر',
-'dropdown.this_year' => 'سال جاری',
+// TODO: translate the following.
+// 'dropdown.current_day' => 'today',
+// 'dropdown.previous_day' => 'yesterday',
+// 'dropdown.selected_day' => 'day',
+'dropdown.current_week' => 'هفته جاری',
+'dropdown.previous_week' => 'هفته آخر',
+// TODO: translate the following.
+// 'dropdown.selected_week' => 'week',
+'dropdown.current_month' => 'ماه جاری',
+'dropdown.previous_month' => 'ماه آخر',
+// TODO: translate the following.
+// 'dropdown.selected_month' => 'month',
+'dropdown.current_year' => 'سال جاری',
+// TODO: translate the following.
+// 'dropdown.previous_year' => 'previous year',
+// 'dropdown.selected_year' => 'year',