Restore latin1 character in ada backend

templates/skeletons/ada/interface-header.tmplt

@@ -28,4 +28,4 @@ procedure @_CAPITALIZE:Name_@
       with Export, Convention => C, Link_Name => "@_LOWER:Parent_Function_@_PI_@_LOWER:Name_@";
 @@ELSE@@
       with Import, Convention => C, Link_Name => "@_LOWER:Parent_Function_@_RI_@_LOWER:Name_@";
-   procedure RIÜ@_CAPITALIZE:Name_@ renames @_CAPITALIZE:Name_@;
+   procedure RIÜ@_CAPITALIZE:Name_@ renames @_CAPITALIZE:Name_@;