Here's how to hide birthday reminders and game notifications in the Tango app:
Launch the Tango app
Tap on the menu button and then on the cog icon (next to your username)
Go to Notifications.
Clear the below checkboxes:
Messages from Games
NB- if you don't want to notify other users about your birthday:
Go to Sharing and clear the Auto post when it's my birthday checkbox:
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