There is as far as I know no consensus for a wiktionary favicon.

Please discuss the issue on meta. and get a very broad support before implement this change.

[ Adding shellpolicy keyword. ]

(In reply to comment #1)

There is as far as I know no consensus for a wiktionary favicon.

Please discuss the issue on meta. and get a very broad support before implement
this change.

Then remove the Wikipedia favicon?

or is someone thinking a "W" letter is suitable for any Wik** project?

I would prefer a wiktionnary-specific favicon.

As Bugzilla isn't a forum to discuss wide changes, I would really suggest to discuss the issue on meta. to know what the community want between a new icon, keep the W or remove the icon.

Consensus is at https://meta.wikimedia.org/wiki/Wiktionary/logo/archive-vote-4 (2006) as summarised in the URL. This was supposed to be done with bug 16315.
Not all Wiktionaries have switched to the new logo after the 2006 decision, but for those which did this is an uncontroversial change.

So what would be the best course of action?

(In reply to comment #6)

So what would be the best course of action?

In short: open each Wiktionary in your browser, list those which use the tile logo, check that they use the tile favicon, fix the favicon for those which don't.

(In reply to comment #7)

In short: open each Wiktionary in your browser

A list would be here: https://noc.wikimedia.org/conf/wiktionary.dblist

Gerrit change 31570.

I have deployed the change on the live cluster so I guess this bug is fixed =)

Also deployed change https://gerrit.wikimedia.org/r/#/c/31584/ which update the logo and favicon for closed wikis.