Each language string can only include placeholders that are specifically passed into it when it is called (otherwise every language string would need to be passed a full range of all possible placeholders that might be wanted in the given context, which would be very complex to program and a massive overhead in terms of site performance).
The only way to add additional data for placeholders would be to modify the core code that uses the 'coursecompletedmessage' language string - something you should consider very carefully before you undertake it (as it adds a maintenance overhead during all future upgrades).
As an aside, all users are encouraged to use their name on these forums, rather than their organisation name. Please could you update your profile?
The only way to add additional data for placeholders would be to modify the core code that uses the 'coursecompletedmessage' language string - something you should consider very carefully before you undertake it (as it adds a maintenance overhead during all future upgrades).
As an aside, all users are encouraged to use their name on these forums, rather than their organisation name. Please could you update your profile?