Minor: Fix checkox mnemonic

idea/idea-analysis/src/org/jetbrains/kotlin/idea/JetBundle.properties

@@ -303,6 +303,7 @@ find.what.functions.usages.checkbox=Usages of &functions
 find.what.properties.usages.checkbox=Usages of &properties
 find.what.constructor.usages.checkbox=Usages of &constructor
 find.what.derived.classes.checkbox=&Derived classes
+find.what.derived.interfaces.checkbox=Derived &interfaces
 
 hierarchy.legend.member.is.defined.in.class=Member is defined in the class
 hierarchy.legend.member.defined.in.superclass=Member is not defined in the class but defined in superclass

idea/src/org/jetbrains/kotlin/idea/findUsages/dialogs/KotlinFindClassUsagesDialog.java

@@ -124,7 +124,8 @@ public class KotlinFindClassUsagesDialog extends FindClassUsagesDialog {
                 findWhatPanel,
                 true
         );
-        derivedTraits = addCheckboxToPanel("&Derived interfaces",
+        derivedTraits = addCheckboxToPanel(
+                JetBundle.message("find.what.derived.interfaces.checkbox"),
                 getFindUsagesOptions().isDerivedInterfaces,
                 findWhatPanel,
                 true