Where is time stamp message for Echo extension?

Hmm. Then maybe these messages are coming from CLDR as suggested by Nike.

Lloffiwr (talk)00:01, 2 December 2013

If that's the case I understand that it is still untranslated. The Sorbian languages are not a part of CLDR yet.

Michawiki (talk)00:04, 2 December 2013

If you have a page showing the message, append the parameter uselang=qqx to its URL (preceed by either ? or & depending on whether ? is already there) and you get the message keys instead of the message contents.

Purodha Blissenbach (talk)19:15, 7 March 2014