English error in the system messages

From semantic-mediawiki.org

Ah, now I got it. Yeah, found the typo and fixed it. I will be great if you could specify the respective system message for faster detection. Thanks a lot for noticing!

13:16, 28 December 2017

Excuse me, kgh! I thought that I link where I found the typo error.

22:35, 8 February 2018

No worries. All is fine now. :)

23:46, 8 February 2018