vcs: fix title for base revision in merge

platform/platform-resources-en/src/messages/VcsBundle.properties

@@ -192,6 +192,7 @@ label.text.when.files.are.deleted.with.idea=When files are deleted with {0}:
 vcs.console.toolwindow.display.name=Console
 merge.version.title.local.changes=Local Changes
 merge.version.title.merge.result=Merge Result
+merge.version.title.base.version=Base Version
 merge.version.title.last.version=Changes from Server
 merge.version.title.last.version.number=Changes from Server (revision {0})
 dialog.title.clear.read.only.file.status=Clear Read-Only Status

platform/vcs-api/src/com/intellij/openapi/vcs/merge/MergeDialogCustomizer.java

@@ -58,7 +58,7 @@ public class MergeDialogCustomizer {
    * @return title that is shown above the center panel in the 3-way merge dialog. "Merge result" by default.
    */
   @Nullable public String getCenterPanelTitle(@NotNull VirtualFile file) {
-    return VcsBundle.message("merge.version.title.merge.result");
+    return VcsBundle.message("merge.version.title.base.version");
   }
 
   /**