app.run(function (GApi) {
    // Load Google Translate Client Library
    GApi.load('translate', 'v2');
});

app.controller('FooCtrl', function(GApi) {
     var params = {}; 
     GApi.execute('translate', 'detections.list', params).then(function (result) {
         // ...
     });
});

$window.gapi.client['translate'].detections.list.execute(params);

app.run(function (GApi, $window) {
    // Load Google Translate Client Library
    GApi.load('translate', 'v2').then(function (result) {
        // the API has been loaded successfully
        $window.gapi.client.translate = $window.gapi.client.language;
    });
});