You can change your company settings within QuickRecruit app. This settings is only visible to user with Admin role. You can update app related settings from this page. You can go to this page by visiting App Settings → Company Settings Page
Language can be changed from here. Language is by default set to English.
Currency can be changed from this settings. Currency is set to USD by default. Currency is used for Billing To Client and Job Posting Salary Range.
Same goes for timezone. It is set to by default.