Hi Michael,
You can do it via loco translate plugin.
You can find a theblogger.pot localization file in the latest release of the theBlogger theme. And everything inside it.
It is easy to create translation files from a pot file.
Just install and activate Loco Translate plugin.
Go to plugin page and find your theme, then click “New language” link. https://wordpress.org/plugins/loco-translate/screenshots/
Thanks