Is there a reason why only "main namespace" pages are mentioned in the above proposal?
Also, does this proposal takes into account the different ways the different communities represent words? E.g. different apostrophes used for aujourd'hui in French and in English (with corresponding redirects in each project).

When will this task get completed ?

I unfortunately can't tell you yet. I am currently looking for someone to work on it.

Relevant links (2015 proposal):

• Task 1: Wiktionary interwiki links
• Task 2: Switch on Phase 1 for Wiktionary

The Wikimedia-Hackathon-2016 starts tomorrow and this task is featured at T119703. We want to use T130776: Wikimedia Hackathon 2016 Opening Session to promote these projects and help recruiting volunteers to work for them.

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Some preliminary thoughts regarding the implementation:

The task will be implemented as an extension that does two things:

• On page edit, update a central data store that the page exists in the language of the currently used wiktionary.
• On page render, query the central data store for all existing translations and insert the information in the page structure.

The "central data store" must be a database that is accessible from all wiktionary projects. Proposed table structure:

lang and title must be indexed.

On initialization the table must be filled with the existing data. This could be done by querying the API and crawling each wiktionary with a bot or by direct database access. This still has to be determined.

Regarding the comment by @Darkdadaah: Wiktionary is in the unique situation that each word should be the same in each language version. Where they differ, there must be a redirect page, as in the case pointed out by Darkdadaah.

In T987#2172207, @gabriel-wmde wrote:

Regarding the comment by @Darkdadaah: Wiktionary is in the unique situation that each word should be the same in each language version. Where they differ, there must be a redirect page, as in the case pointed out by Darkdadaah.

There are some exception cases:

• proverbs are in some anguage as sentence (First capital and dot at the end.), in some with firs lowcase and without dot
• words containing '

@gabriel-wmde worked on this at Wikimedia-Hackathon-2016 - "not ready but getting there"

@gabriel-wmde It'd be great if you can post a status update here. Then I can help you figure out who can review it and so on. If you want I can also see if you can continue this on work-time.

Current status:

• The extension is in a repository at https://gerrit.wikimedia.org/r/mediawiki/extensions/Cognate
• @daniel had a look at the code which led to several TODOs and improvements.
• @Addshore submitted some patches.

Next steps:

• Add code for the remaining TODO comments.
• Address the cases where the title is different in the original language (as raised by @JAnD and @Darkdadaah, I'll add a separate comment with a proposal on how to address this).
• Create a maintenance script that fills the database.
• ???
• Profit Deploy

After the comments from @JAnD and @Darkdadaah I have lots of questions on how disparate the page titles for each language are.

As far as I understand, some Wiktionary projects have their own, localized spelling that deviates from the "standard" spelling of Wiktionary, for adhering to the spelling standards of the language they are in.

Some questions:

• Do wiktionary words exist in more than 2 variations of a word across all translations? If they do, how big is the variation?
• Is the wiktionary project doing the localized spelling only for the language they are for (e.g. the French Wiktionnaire has French apostrophes in french words and phrases, but leaves the apostrophes of other languages words and phrases as-is).
• Is the localized spelling consistent inside one wiktionary?
• For which percentage (roughly) of localized pages does a redirect from the standard spelling to the localized spelling exist?
• Would it be possible to "Normalize" page titles algorithmically (search and replace with regular expressions)?
• Words in different scripts (Cyrillic, Hebrew, Arabic, etc.) don't have these issues? Or Do they have even graver issues?

Is there someone who can reliably answer these questions for all wiktionaries? Otherwise the next step in this issue would be to write a program that analyzes the deviations.

@gabriel-wmde I did some work like this a long time ago, see https://www.wikidata.org/wiki/Wikidata_talk:Wiktionary#First_and_second_phases. I'll see if I can do an update...