Add the ability to quickly delete a couple of stuff

src/message/delete_messages.py

@@ -0,0 +1,21 @@
+from message.message import Message
+
+
+class DeleteComment(Message):
+    def update_model(self, model):
+        model.entry.comment = ""
+        
+        
+class DeleteVariants(Message):
+    def update_model(self, model):
+        model.entry.variants = []
+        
+        
+class DeleteRelatedEntries(Message):
+    def update_model(self, model):
+        model.entry.related_entries = []
+        
+        
+class DeleteEntryLabels(Message):
+    def update_model(self, model):
+        model.entry.labels = []