PickPlugins Invoice

Dear Madam or Sir,

I installed your plugin PickPlugins Invoice for WooCommerce on my site https://www.distribuiraj.me/ and i love it works great (only one that worked from all other similar plugins i tried) i have 2 questions if you can help me

- on invoice preview all letters are displayed correctly but on pdf letters like č and ć are not displayed, do you know how to fix this (screenshot and pdf invoice are in attachment)

- can you tell me how to translate date to Croatian (i need to translate months)

Best Regards
Dubravko