Internationalization settings section contains the following parameters:
Default Domain - the domain system will use by default if not specified for a phrase in a template;
Default Language - the language set by default for the system;
Mark Phrases That Are Not Translated - allows highlighting all not translated phrases and translating them from the front-end;
Timezone - set a needed time zone that will be used for a job board.
After you selected all needed values for the parameters described above, press the “Save” button to submit the changes, also you can use the "Apply" button to save the changes and stay on the current tab.