Need detailed analysis of text key.

Hi All,

I need detailed analysis of following text key :

error.notes.send_user_ambiguous_login    = {1,choice,1#The username is ambiguous|1<The following usernames are ambiguous}: {0}.

Following is the scenario:

Currently, I am getting error like  The username is ambiguous: <username>  on PrivateNotesPage whereas I want it like this :  The username is ambiguous.(no need to display username).

I think, I have to remove {0} from value part. But I am not sure. I doubt that it may affect on any other scenario in community.

Can you please help me to understand the syntax. 

Thanks,

Vishwajeet