cubicweb #2527594 msgcat output in cubicweb-ctl [done]

When regenerating the i18n catalogs, msgcat and msgfmt output is printed to the terminal. It looks like an error to any person that is not used to seeing it. silencing it seems to be the best option.

prioritynormal
typebug
done in3.16.0
load0.100
load left0.000
closed by#61c4bdd70dd8 [cw-ctl] silence msgcat and msgfmt (closes #2527594)