vnstat2-php-frontend/lang/pl.php

<?php

// sidebar labels
$L['summary'] = 'podsumowanie';
$L['hours'] = 'godziny';
$L['days'] = 'dni';
$L['months'] = 'miesiące';

// main table headers
$L['Summary'] = 'Podsumowanie';
$L['Top 10 days'] = 'Top 10 dni';
$L['Last 24 hours'] = 'Ostatnie 24 godziny';
$L['Last 30 days'] = 'Ostatnie 30 dni';
$L['Last 12 months'] = 'Ostatnie 12 miesięcy';

// traffic table columns
$L['In'] = 'Wyjście';
$L['Out'] = 'Wejście';
$L['Total'] = 'Suma';

// summary rows
$L['This hour'] = 'Ta godzina';
$L['This day'] = 'Ten dzień';
$L['This month'] = 'Ten miesiąc';
$L['All time'] = 'Całość';

// graph text
$L['Traffic data for'] = 'Transfer dla';
$L['bytes in'] = 'Wysłane';
$L['bytes out'] = 'Odebrane';

// date formats
$L['datefmt_days'] = '%d %B';
$L['datefmt_days_img'] = '%d';
$L['datefmt_months'] = '%B %Y';
$L['datefmt_months_img'] = '%b';
$L['datefmt_hours'] = '%l%p';
$L['datefmt_hours_img'] = '%l';
$L['datefmt_top'] = '%d %B %Y';