Bug 520100 - Confirm Exit dialog has no mnemonic on "Exit" button label

* adds mnemonic

Change-Id: I130fb4562bb22657c7b95247fa1e24fa72d2a9ba
Signed-off-by: David Weiser <david.weiser@vogella.com>
diff --git a/bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/messages.properties b/bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/messages.properties
index 2ca3bd1..7474e5e 100644
--- a/bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/messages.properties
+++ b/bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/messages.properties
@@ -151,7 +151,7 @@
 PromptOnExitDialog_message0 = Exit application?
 PromptOnExitDialog_message1 = Do you want to exit the {0}?
 PromptOnExitDialog_choice = &Always exit without prompt
-PromptOnExitDialog_button_label_exit=Exit
+PromptOnExitDialog_button_label_exit=&Exit
 
 Workbench_shortcuts = Navi&gation
 Workbench_openNewWindow = &New Window