tde_create_translated_desktop: Fix characters not permitted for target name.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 870ade6418)

modules/TDEMacros.cmake

@@ -1989,8 +1989,9 @@ macro( tde_create_translated_desktop )
 
     # prepare a full name for the target
     get_filename_component( _target ${_basename} ABSOLUTE )
-    file( RELATIVE_PATH _target "${CMAKE_SOURCE_DIR}" "${_target}" )
-    string( REPLACE "/" "+" _target "${_target}-translated" )
+    file( RELATIVE_PATH _target "${CMAKE_SOURCE_DIR}" "${_target}-translated" )
+    string( REPLACE "/" "+" _target "${_target}" )
+    string( REPLACE "@" "_" _target "${_target}" )
 
     if( NOT TARGET ${_target} )