New translations file.mdx (Korean)

[ci skip]

website/src/lib/docs/ko/menu/file.mdx

@@ -15,6 +15,10 @@ The file actions menu contains a set of pretty self-explanatory file operations.
 
 Create a new empty file.
 
+### <Plus size="16" class="inline-block" style="margin-bottom: 2px" /> New route file
+
+Create a new file containing an empty [route](../gpx).
+
 ### <FolderOpen size="16" class="inline-block" style="margin-bottom: 2px" /> Open...
 
 Open files from your computer.