cubicweb #16272177 [devctl] make i18n custom message extractors work with legacy layouts [validation pending]

[devctl] make i18n custom message extractors work with legacy layouts

distname needs to be "cubicweb_<cubename>", even with legacy layouts for pkg.load_entry_point() to work

prioritynormal
typebug
done in3.24.1
load left0.000
closed by#adf0212d1dcc [devctl] make i18n custom message extractors work with legacy layouts
patch[devctl] make i18n custom message extractors work with legacy layouts [rejected][devctl] make i18n custom message extractors work with legacy layouts [applied]