feat(i18n): bilingual language + roles selectors in user dialogs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

APP/src/app/features/users/components/create-user-dialog/create-user-dialog.component.html

@@ -12,6 +12,7 @@
     <kendo-formfield>
       <kendo-label text="Roles *"></kendo-label>
       <kendo-multiselect formControlName="roles" [data]="roleOptions"
+        textField="label" valueField="value" [valuePrimitive]="true"
         placeholder="Select roles"></kendo-multiselect>
       <kendo-formerror>At least one role is required.</kendo-formerror>
     </kendo-formfield>
@@ -19,7 +20,7 @@
     <kendo-formfield>
       <kendo-label text="Language"></kendo-label>
       <kendo-dropdownlist formControlName="languagePreference"
-        [data]="langOptions" textField="text" valueField="value"
+        [data]="langOptions" textField="label" valueField="value"
         [valuePrimitive]="true">
       </kendo-dropdownlist>
     </kendo-formfield>