Show appropriate error message if member haven't access to private challenges

[luizrrodrigues]

https://topcoder.atlassian.net/browse/PROD-1643

[luizrrodrigues]

@codejamtc Can you confirm if we'll keep default message (below of modal) and if this title looks good:

[codejamtc]

@luizrrodrigues I can see a typo: available

[luizrrodrigues]

@codejamtc Thanks, fixed.

Other questions is good?

[codejamtc]

@luizrrodrigues This is the message posted on JIRA

“This challenge is only available to those in a private group. It looks like you do not have access to this challenge. If you believe you are receiving this message in error, please reach out to support.”

[luizrrodrigues]

@codejamtc So we'll remove default message:
We are sorry that you have encountered this problem. Please, contact our support ‌[support@topcoder.com](mailto:support@topcoder.com)‌ to help us resolve it as soon as possible.

I'm asking because this modal is a template to all msg error in CA, dynamic parts is just title and first line, msg above is fixed. Then if we going to remove I'll create a new template without this msg.

[codejamtc]

@lakshmiathreya Please check