Flow/Converting talk pages

We manually follow these steps when Enabling Flow on individual talk pages, this is the automation to do it for all pages in a namespace.

The first, and so far only, wiki on which we've done this is "officewiki", the WMF's internal wiki.

First we convert any existing LiquidThreads pages to Flow boards, see Flow/Converting LiquidThreads.

What happens in conversion

 * "User:Flow talk page manager" moves existing talk page to Talk page name/Archive (/ArchiveN+1 if there are existing archive pages)
 * this archive page has a template that wikis can customize.
 * takes the content of the page above the first section and adds it to the Flow board header.
 * For usertalkpages, a Notification email will be sent, and yellow bar Echo indicator will display. For enotifwatchlistpages, an email will be sent.
 * adds a  template to the Flow board header, indicating conversion and linking to the archived page.
 * wikis can customize this template however they prefer.

Steps on local wiki
Recommended steps on the local wiki, with messages localized in local language.
 * Create the user page with title defined at MediaWiki:Flow-talk-username explaining its purpose. Example: User:Flow talk page manager.
 * Create a template with the title defined at MediaWiki:Flow-importer-wt-converted-archive-template with optional parameters "from" and "date". Example: Template:Archive for converted wikitext talk page.
 * Create a template with the title defined at MediaWiki:Flow-importer-wt-converted-template with optional parameters "archive" and "date". Example: Template:Wikitext talk page converted to Flow.
 * Check if pattern for archived pages defined at MediaWiki:Flow-special-enableflow-archive-title-format-default-value is appropiate.

Issues

 * Needs to check for namespace subpage setting
 * Needs to respect the guidelines for what is obsolete and can be archived
 * Talk pages exist in the WikiNow
 * ToDo: Subpages that are the talk pages for subpages in the related article namespace should also be converted, see T76772