Fix translation for required hint

Change-Id: I3207656870289bcc9d32c9088813d18d9a04b4f6

cmk/gui/valuespec/definitions.py

@@ -5935,7 +5935,7 @@ def _render_input_normal(
                 # where it is clear from the context if values are required or not. Therefore, we
                 # dont add a required label in this case.
                 if not two_columns and not vs.allow_empty():
-                    html.span(" (required)", class_="required")
+                    html.span(_(" (required)"), class_="required")
 
             if two_columns:
                 if vs.title() and not colon_printed: