clarify filename

website/src/lib/components/file-list/metadata/MetadataDialog.svelte

@@ -9,6 +9,8 @@
     import { editMetadata } from '$lib/components/file-list/metadata/utils.svelte';
     import { engine, type FileState } from '$lib/engine';
     import type { FileTreeNode } from '$lib/engine/selection-helpers';
+    import { toast } from 'svelte-sonner';
+    import { get } from 'svelte/store';
 
     let {
         fileState,
@@ -53,8 +55,15 @@
                 // would open the dialog again before the effect below has reset it
                 editMetadata.current = false;
                 open = false;
-                // the metadata of the selected elements are changed
-                engine.metadata(name, description);
+                // the metadata of the selected elements are changed. In the desktop app, a file on
+                // the disk is renamed with it, which is refused if the name is the one of another
+                engine.metadata(name, description).then((changed) => {
+                    const error = get(engine.lastError);
+                    if (!changed && error !== undefined && error !== 'nothing to do') {
+                        // a key of the dictionaries, when it comes from the desktop app
+                        toast.error(i18n._(error, error));
+                    }
+                });
             }}
         >
             <Save size="16" />