refactor: use new backend version (2.x.x)

Close #74

src/app/modules/data/data.provider.ts

@@ -38,11 +38,9 @@ export class DataProvider {
    */
   private _storagePrefix = 'stapps.data';
   /**
-   * TODO
-   * 
-   * @TODO: get backendUrl and appVersion and storagePrefix from config (module)
+   * Version of the app (used for the header in communication with the backend)
    */
-  appVersion = '1.0.6';
+  appVersion = environment.backend_version;
   /**
    * TODO
    */
@@ -58,7 +56,7 @@ export class DataProvider {
 
   /**
    * TODO
-   * 
+   *
    * @param stAppsWebHttpClient TODO
    * @param storageProvider TODO
    */