feat(task-list): enhance empty state display in task list component

- Added EmptyListPlaceholder component to visually represent the empty state in the task list.
- Adjusted styling and layout for the empty group drop zone to improve user experience.
- Removed unused progress properties from the task group data structure for cleaner code.

worklenz-frontend/src/components/EmptyListPlaceholder.tsx

@@ -1,17 +1,24 @@
 import { Empty, Typography } from 'antd';
 import React from 'react';
+import { useTranslation } from 'react-i18next';
 
 type EmptyListPlaceholderProps = {
   imageSrc?: string;
   imageHeight?: number;
-  text: string;
+  text?: string;
+  textKey?: string;
+  i18nNs?: string;
 };
 
 const EmptyListPlaceholder = ({
   imageSrc = 'https://s3.us-west-2.amazonaws.com/worklenz.com/assets/empty-box.webp',
   imageHeight = 60,
   text,
+  textKey,
+  i18nNs = 'task-list-table',
 }: EmptyListPlaceholderProps) => {
+  const { t } = useTranslation(i18nNs);
+  const description = textKey ? t(textKey) : text;
   return (
     <Empty
       image={imageSrc}
@@ -22,7 +29,7 @@ const EmptyListPlaceholder = ({
         alignItems: 'center',
         marginBlockStart: 24,
       }}
-      description={<Typography.Text type="secondary">{text}</Typography.Text>}
+      description={<Typography.Text type="secondary">{description}</Typography.Text>}
     />
   );
 };