fix bug where tx_fail string was too long

wowstash/blueprints/wallet/routes.py

@@ -208,7 +208,7 @@ def send():
             msg = tx['message'].capitalize()
             msg_lower = tx['message'].replace(' ', '_').lower()
             flash(f'There was a problem sending the transaction: {msg}')
-            capture_event(user.id, f'tx_fail_{msg_lower}')
+            capture_event(user.id, f'tx_fail_{msg_lower[0:50]}')
         else:
             flash('Successfully sent transfer.')
             capture_event(user.id, 'tx_success')