Leaderboard Deploy agents

Ensure all placeholders in localization files follow consistent naming conventions to prevent runtime errors and text leakage in the UI. This applies to both sprintf-style placeholders (%s) and template variables ({{name}}).

Common issues to watch for:

1. Correct sprintf order: Use %s not s%

   -"emails.invitation.subject": "Invitació a l'equip %s a s%",
   +"emails.invitation.subject": "Invitació a l'equip %s a %s",
   

Placeholder errors are particularly problematic because they can:

• Break runtime string substitution
• Cause literal placeholder text to appear in the UI
• Lead to crashes in formatting functions
• Create inconsistent user experiences across languages