Move 'util::content_size_pretty' into 'acs-lang' and rename it to 'lc_content_size_pretty', localicing 'bytes' and adapting automated tests. Bump 'acs-lang' version.
Add deleted column to acs-lang 'package-list', and fixed number of messages depending on status, making it coherent with 'message-list'. Also fixed translated/untranslated count on default locale in 'message-list'. Version bump.