Not true, actually. You can:
See these lines, here and here:
$str = sprintf($this->_('%1$s %2$d of %3$d'), $label, $pageNum, $totalPages); // Page quantity, i.e. Page 1 of 3
$str = sprintf($this->_('%1$s %2$d to %3$d of %4$d'), $label, $start, $end, $total); // Pagination item quantity, i.e. Items 1 to 10 of 50
Here's how to do it ?
Setup -> Languages -> Your Language
Find Files To Translate
Look for \core\PaginatedArray.php under Translatable files in /wire/
Select #3
Click Submit
Translate!