🌐(frontend) make empty doc grid message translatable

We personalize the empty doc grid message and
make it translatable.

src/frontend/apps/impress/src/features/docs/docs-grid/components/DocsGrid.tsx

@@ -193,6 +193,7 @@ export const DocsGrid = () => {
         pagination={pagination}
         onSortModelChange={setSortModel}
         sortModel={sortModel}
+        emptyPlaceholderLabel={t("You don't have any document yet.")}
       />
     </Card>
   );