Hi,
Contacts Control is available in Japanese, that's a great news!
So I tried to use market="ja" as API reference says, but the control did not appear. I changed the value: market="jp", and worked fine in Japanese.
Which ("ja" or "jp") is the right value Is this a documentation bug, or an implementation bug

Live Contacts Control Japanese support
Dmylrea
Raulsassaa
Leandro Rodrigues
Actually, we goofed. "jp" is the country code, but in a language/market spec (aa-bb), the first part (aa) is the language, followed by the country or region code (bb). When specifying a regionless market, you can just give the first part, the language code. Thus, "jp" by itself is incorrect. The language code for Japanese is "ja". The full market spec for Japanese / Japan is "ja-jp".
We will be correcting this in the next release of the contacts control, to support "ja" and "ja-jp". For backwards compatibility for existing web apps that are using "jp", we will continue to support "jp" for the near future, but it will eventually go away.
-Danny