Aniti

Im not coder, so I made so stupid mistake><
I tried the function
pll_register_string($name, $string, true);
without inserting the name

But finally I get it.

For someone who will have the same question
now I have

pll_register_string('header_text', 'title', true);

in my functions.php

and

<h3 ><?php pll_e('title'); ?></h3>

in my front-page.php

it was so simple><
I should study coding~

Thank you!