Update error message modal

[igoroshko]

When an error is returned by the backend, the error message modal is displayed. We need to make some adjustments to it:

1. Change modal title from CONFIRMATION to ERROR
2. Change the message to red color - #EF476F
   

[igoroshko]

@suppermancool can you please implement it?

[suppermancool]

@igoroshko ok

[suppermancool]

@igoroshko done in topcoder-platform/community-app#6742