-// 'form.reports.select_period' => 'Select time period',
-// 'form.reports.set_period' => 'or set dates',
-// 'form.reports.show_fields' => 'Show fields',
-// 'form.reports.group_by' => 'Group by',
+'form.reports.select_period' => 'Výberte období',
+'form.reports.set_period' => 'nebo určete dny',
+'form.reports.show_fields' => 'Zobrazit pole',
+'form.reports.group_by' => 'Seskupit podle',
+// TODO: translate the following.