Problem with translation in post template (Single Post Template – Default PRO

Hi.
We are setting up a website with Newspaper Theme (Default PRO). We have already downloaded the translation file (Spanish) from the Theme panel. However, some items continue to be displayed in English.
For example, the indicator that shows the source and labels at the end of the articles:

El mismo problema se observa en el título de los widgets en el sidebar que acompaña los artículos. The widget title continues to appear in English (Most Popular) instead of the Spanish translation found in the Theme Panel:

Could you tell me how to solve this problem?

Thank you a lot in advance.
Regards,
Nestor

I’m sorry!
I did not translate one of the sentences in the previous message.

The same problem is observed in the widgets title on the sidebar that accompanies the articles.(El mismo problema se observa en el título de los widgets en el sidebar que acompaña los artículos.)

Interestingly, in the mobile theme, the translations appear correctly:

Thanks a lot Vlad!!