Add missing description for prototype decorator. The

prototype label decorator did not provide a description. The description
box in the Label decoration was left empty in the preference page. This
commit adds a description to so that it appears in the description box
like the rest of the entries in the label decorations preference page.

Author: elsazac

debug/org.eclipse.debug.ui/plugin.properties

@@ -418,6 +418,7 @@ debug.core.component.label = Platform Debug Core
 GroupLaunch.description=Launch several other configurations sequentially
 
 prototype.decorator.label = Prototype Decorator
+prototype.decorator.description = Decorates launch configurations that are marked as prototypes with an overlay icon.
 breakpointLabel.label= Label
 breakpointLabel.tooltip= Provide a custom label to quickly identify breakpoint
 breakpointLabelCommand = EditBreakpointLabel

debug/org.eclipse.debug.ui/plugin.xml

@@ -3374,6 +3374,9 @@ M4 = Platform-specific fourth key
             lightweight="true"
             location="TOP_RIGHT"
             state="true">
+         <description>
+            %prototype.decorator.description
+         </description>
          <enablement>
             <objectClass
                   name="org.eclipse.debug.internal.core.LaunchConfiguration">