- added npm package dotenv-webpack for using env variables on clientside

- added API File Controller for downloading files e.g. /api/download/1022
- also create has codes by submitting new dataset
- added edit dataset functionalities for role submitter
- added the following route for role submitter: /dataset/:id/update', 'DatasetController.update'
- created extra UpdateDatasetValidator.ts for validating updated dataset
- npm updates

app/Validators/CreateDatasetValidator.ts

@@ -136,7 +136,7 @@ export default class CreateDatasetValidator {
         'unique': '{{ field }} must be unique, and this value is already taken',
         // 'confirmed': '{{ field }} is not correct',
         'licenses.minLength': 'at least {{ options.minLength }} permission must be defined',
-        'licenses.*.number': 'Define roles as valid numbers',
+        'licenses.*.number': 'Define licences as valid numbers',
         'rights.equalTo': 'you must agree to continue',
 
         'titles.0.value.minLength': 'Main Title  must be at least {{ options.minLength }} characters long',