finnish-language-pack ä, ö letters not displaying

[oskar269]

Hello,

I have installed "https://www.mageplaza.com/magento-2-finnish-language-pack.html" this language pack at my website (magento 2.3.) and I am getting few issues. Number one issue is that when i click on "Print Invoices" of any order there is few characters in pdf invoice that are displaying: "instead of (ä) letter pdf invoice displays \u00e4". I have also tried to convert the text by creating a custom file fi_FI CSV file to covert the text, but it is also not working, it is working fine at default magento 2 theme.

Any suggestions, what may be the cause of this? Waiting for your response.

Thanks!