The dynamic text could not be automatically translated.
Run POEdit, then go to File > New…
Select the language of your translation strings in the plugin
Go to File > Save and save the file somewhere (recommended to put it in the languages folder inside your plugin)
Click “Extract From Sources”
Click the small “+” button under “Paths” (bottom left corner) and select the main folder of your plugin
Click the “Sources Keywords” tab along the top
Click the small add button (second from the left)
Enter __ (that’s two underscores) then press enter
Click on the small add button again, then enter _e (underscore then e) and press enter
Repeat to add any additional functions you might have used to translate in your plugin, such as esc_html__ (with two underscores at the end)
Verify all your strings were found, otherwise go to Catalog > Properties… in the menu and add any additional translation functions (like esc_attr__) in the Sources Keywords tab
Go to File > Save to save your .mo file again
Include the .po and .mo files in your plugin’s languages/ folder or make it available for download somewhere.