Mailster is used around the world and while many installations are running with an English localization even more don’t.
Once you enable Mailster it will try to download your localization from translate.mailster.co. If you language is not supported yet or WordPress wasn’t able to load the language files you will get Mailster in it’s default language.
If you switch the language of your site later you have to manually load the required files.
Go to Dashboard => Updates and find the “Translations” section
Click on “Update Translations” and your localization will get loaded.
Whenever there’s an update to your language you can repeat this step.
If you’re not happy with the translation in you language you can add your custom translations file.
Download your language with the steps described above.
Go to the wp-content/languages/plugins folder and copy the mailster-xx_XX.po and mailster-xx_XX.mo file into wp-content/uploads/mailster/languages (xx_XX is your actual language).
Mailster will now use the mailster-xx_XX.mo file in this folder. To change the strings you can use tools like Poedit to create your own mailster-xx_XX.mo file.