I have made a .mo file for the plugin and put it in the languages/ folder. Translation for the admin area work fine but on the frontend the strings are always in english.
Here is my modified .mo/.pot files. Just drop them into languages folder:
You'll need to set the language in wp-config.php to:
Then you can observe in the admin area the Save Settings button changes language to "Spara inställningar" correctly, but on the frontend the "Show available times" button does not change language, even though it is also translated in the same .mo file
Let me know if you need more info.