You must first register all these strings for translation.
For example you echo "Hello world" in some template file like this:
<?php pll_e('Hello world'); ?>
To show string in the "Strings translation" add in your functions.php
:
add_action('init', function() {
pll_register_string('mytheme-hello', 'Hello world');
});
Add all custom strings you want to translate to this function.
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