Better handle 401 responses

[novalisdenahi]

Describe the purpose of your pull request

• Better 401 response handling
• update ng-configcat-publicapi and ng-configcat-publicapi-ui to latest version
• Support JSON Text Setting creation and flags
• Stuck LIINK button

Related issues (only if applicable)

• Trello ticket 401
• Trello ticket JSONText
• Trello ticket Link bug

How to test? (only if applicable)

• What part of the application was affected by the changes? What should be tested?

Security (only if applicable)

• Describe any potential risks that could affect the component in terms of security.

Requirement checklist (only if applicable)

• I have covered the applied changes with automated tests.
• I have executed the full automated test set against my changes.
• I have validated my changes against all supported platform versions.
• I have read and accepted the contribution agreement.