Translations:Flow/Proposal for Ptwikibooks/3/en

Detailed background information, follows: Over the past few months, the 1,600+ pages using LiquidThreads at mediawiki.org have all been converted to use the Flow extension (e.g. mw:Project:Support desk). LiquidThreads has not been well-supported for a long time, and Flow now has 15 wikis actively using it, including 4 wikis using it for daily work (e.g. Catalan Wikipedia's Village Pumps (ca:Viquipèdia:La_taverna) and their entire Viquipèdia_Discussió namespace, the French and Polish Wikipedia's Newcomer's helpdesks (w:fr:Wikipédia:Forum des nouveaux and w:pl:Pomoc:Pytania nowicjuszy), the Portuguese Wikipedia's Contact Wikipedia noticeboard (w:pt:Wikipédia:Contato/Fale com a Wikipédia, plus most of mediawiki.org)