wait for content to display till all translated values are download

I am working on angular 1.5 application. We are using angular-translate module to show content for different language when user selects language from drop down. Now we are using $translateProvider.useStaticFilesLoader({ prefix: ‘http://localhost:3001/i18n/‘, suffix: ‘.json’ }); to load these translated key value pair from external source.
But how to I make sure that all translated values should be downloaded before my content to display.

Source: AngularJS