{{msg-nocc|Html_contacts|notext=1}}

The same is valid for message Html contact count.

NOCC has no plural support for L10n, unfortunately. Please report it in its bug tracker.

Thank you.

But, what the parameter does stand for? If it is not a number but e.g. a user name it is better to change the word order in hsb and dsb. (Contacts %1$s instead of $1$s Contacts)

"%1$d" is a number. The number of contacts.