add EmptyView to DownloadQueue, refactro strings (#53)

* Added the Emty view message in the /download path

* Changed a few expression to template string

src/screens/manga/DownloadQueue.tsx

@@ -24,6 +24,7 @@ import DragHandleIcon from '@mui/icons-material/DragHandle';
 import ListItem from '@mui/material/ListItem';
 import { ListItemIcon } from '@mui/material';
 import ListItemText from '@mui/material/ListItemText';
+import EmptyView from 'components/EmptyView';
 
 const baseWebsocketUrl = JSON.parse(window.localStorage.getItem('serverBaseURL')!).replace('http', 'ws');
 
@@ -91,6 +92,10 @@ export default function DownloadQueue() {
     const onDragEnd = (result: DropResult) => {
     };
 
+    if (queue.length === 0) {
+        return <EmptyView message="No downloads" />;
+    }
+
     return (
         <>
             <DragDropContext onDragEnd={onDragEnd}>