How to correctly translate the Osclass template into my language, if the template does not have a translation? Edit en_US -> theme.po ?
If theme does not have languages folder, it's not normal osclass theme.
Ok, you need PoEdit and read this manualTheme have languages folder and have en_US folder, theme not have MY language folder and MY language translation.
Ok, you need PoEdit and read this manual
How to translate themes and plugins - OsclassPoint Blog
Manage translations in backoffice Osclass 8.1.0 came with great update that allows to manage translations from backoffice, without need to locate .po and .mo fi...osclasspoint.com
...or
1. create folder (for example de_DE) in theme languages folder
2. Open Poedit, click "Create new translation" and select theme.po file in en_US folder
3. select language from list and save file to new (de_DE) folder
4. Translate all rows and save