Bug #15609 : Collect - Save button display issue

Author: Hassane Diaby

ui/ui-frontend/projects/collect/src/app/collect/archive-search-collect/archive-preview/archive-unit-description-tab/archive-unit-description-tab.component.html

@@ -2,7 +2,7 @@
 
 <div *ngIf="editMode">
   <vitamui-common-editor-banner [title]="'ARCHIVE_UNIT.EDITOR_BANNER.TITLE' | translate: { sedaVersion: '2.2' }" class="editor-banner">
-    <button (click)="onSave()" [disabled]="!canSave" class="btn primary save">
+    <button (click)="onSave()" [disabled]="!canSave" class="btn" [ngClass]="isModified() ? 'save' : 'primary'">
       {{ 'COMMON.SAVE' | translate }}
     </button>
     <button (click)="onCancel(true)" class="btn primary cancel">