Yes, I’m using a translation, and yes, it seems that it’s a bug in the translation. I’m using the Dutch translation (nl_NL), and I guess the error is in these lines:
#: inc/template-tags.php:424 inc/template-tags.php:432
msgctxt “Used between list items, there is a space after the comma.”
msgid “, ”
I tried to correct it with Poedit, but for some reason Poedit won’t save the file correctly, giving errors. Maybe you could update the Dutch translation file? I’m sure others are effected as well.