fix(service): fix lost of data in async loader / error in runtime

Accidently, a promise handler for loading translations transform the data into `undefined` internally resulting into type/npe at runtime.

Relates #1471

src/service/translate.js

@@ -1674,6 +1674,7 @@ function $translate($STORAGE_KEY, $windowProvider, $translateSanitizationProvide
         if (!$translationTable[key] && $loaderFactory && !langPromises[key]) {
           langPromises[key] = loadAsync(key).then(function (translation) {
             translations(translation.key, translation.table);
+            return translation;
           });
         }
       };
@@ -2080,6 +2081,7 @@ function $translate($STORAGE_KEY, $windowProvider, $translateSanitizationProvide
               useLanguage($uses);
             }
             resolve();
+            return data;
           };
           oneTranslationsLoaded.displayName = 'refreshPostProcessor';