feat(select-resource-class): allow accented character (DSP-1241) (#363)

* refactor(select-resource-class): update regex pattern to allow accented character

* refactor(select-resource-class): update the pattern

Co-authored-by: flaurens <flavie.laurens@unibas.ch>

src/app/workspace/resource/resource-instance-form/select-resource-class/select-resource-class.component.ts

@@ -39,7 +39,7 @@ export class SelectResourceClassComponent implements OnInit, OnDestroy, AfterVie
 
     form: FormGroup;
 
-    checkPattern = '^\d*[a-zA-Z0-9_]+( [a-zA-Z0-9@_.]+)*$';
+    checkPattern = '^\d*[a-zA-Z0-9\u00C0-\u024F\u1E00-\u1EFF_]+( [a-zA-Z0-9\u00C0-\u024F\u1E00-\u1EFF@_.]+)*$';
 
     resourceChangesSubscription: Subscription;