Hello Samir,
Thank you so much for you question. You have different method to translate the “You are here” on the breadcrumb. Please prefer the suitable and simple method.
1. Create a mo file of the theme and add inside the languages folder. https://codex.wordpress.org/I18n_for_WordPress_Developers
2. Just edit that file, breadcrumb.php. Write your own text instead of You are here.
Note: We strongly recommended you to use child theme for theme customization or edit.
https://codex.wordpress.org/Child_Themes
If you have any further query, please feel free to ask.
Best Regards,
Acme Supports