Mantis Bug Tracker - Forums

I would advise not to do this kind of configuration, but if you must, try overriding the appropriate language strings in config/custom_strings_inc.php (create the file if needed) with something like switch( helper_get_current_project() ) { case 1: $s_summary = 'Alarm'; break; case 2: $s_summary = '...

No, is not available as far as I know.
What you could do, is use 2 instances of mantis, each having dedicated titles for those fields.
You could arrange access to both instances via a simple portal page