rss收藏增加批量删除 (#4444)

app/src/main/res/values/strings.xml

@@ -30,6 +30,7 @@
     <string name="draw">Warning</string>
     <string name="edit">Edit</string>
     <string name="delete">Delete</string>
+    <string name="delete_select_group">Delete Select Group</string>
     <string name="delete_all">Delete all</string>
     <string name="custom_export_section">Custom export chapter of epub</string>
     <string name="replace">Replace</string>