Hi, Jacek
First, thanks for your purchase.
For the first question:
The shipping info tab is additional product tab. You can change that on admin->theme options->single product->filter tabs.
https://prnt.sc/v191uf
If you want to change the "Shipping info" title, please change the additional tab title value.
And to change the tab content, please replace the tab content html block.
For the second question:
On which page did you get that error? Could you explain in detail again with screenshot images?
Then, we'll check in detail and provide solution quickly.
Best Regards, C-Themes
Hi, Jacek
Sorry for our misunderstanding.
Those words are all in woocommerce plugin.
So please install the translation plugin and translate the woocommerce plugin words to your Polish language.
We recommend you the loco translate plugin.
Please translate the woocommerce plugin words with the loco translate plugin. And you also need to translate lorada theme & lorada-core plugin to translate your website perfectly.
If you have any other questions, please let us know again without hesitation.
Best Regards, C-Themes