Anyone working on this would have to provide two patches for the files i18n/en.json in the LiquidThreads and GuidedTour Git repositories...

@Jdforrester-WMF When should {{int:publishchanges}} vs. {{int:publishpage}} be used?

In T164771#4568241, @SBisson wrote:

@Jdforrester-WMF When should {{int:publishchanges}} vs. {{int:publishpage}} be used?

{{int:publishchanges}} is for when the user is changing a page that already existed; {{int:publishpage}} is when they are creating a page from scratch. In the context of GuidedTour, I think that those would suffice; for LQT, perhaps a new message would be needed for "publish post", "publish topic", etc., or you could just always use {{int:publishchanges}} depending on product desire.

Change 460077 had a related patch set uploaded (by Sbisson; owner: Sbisson):
[mediawiki/extensions/GettingStarted@master] Use "Publish changes" instead of "Save changes"

https://gerrit.wikimedia.org/r/460077

Change 460090 had a related patch set uploaded (by Sbisson; owner: Sbisson):
[mediawiki/extensions/LiquidThreads@master] Use "publish" instead of "save" for summary page

https://gerrit.wikimedia.org/r/460090

guidedtour-tour-firstedit-save-description was changed in https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/GuidedTour/+/451617/ (T201589: Wrong wording in Wikipedia editor tip popup - says "Save Page", should say "Publish Changes")

Change 460090 merged by jenkins-bot:
[mediawiki/extensions/LiquidThreads@master] Use "publish" instead of "save" for summary page

https://gerrit.wikimedia.org/r/460090

Change 460077 merged by jenkins-bot:
[mediawiki/extensions/GettingStarted@master] Use "Publish changes" instead of "Save changes"

https://gerrit.wikimedia.org/r/460077

@SBisson why the following messages have ""Aldaketak argitaratu"" text (it's Basque) ? "Aldaketak argitaratu" will be displayed for any language .

"lqt-update-summary-intro": "Please summarize the below thread in the editing box.\nYou may use any wikitext in your summary.\nWhen you finish, click \"{{int:publishchanges}}\".

https://translatewiki.net/wiki/MediaWiki:Guidedtour-tour-firstedit-save-description/en

MediaWiki:Guidedtour-tour-firstedit-save-description/en
When you're ready, clicking "Aldaketak argitaratu" will make your changes visible for everyone.

https://translatewiki.net/wiki/MediaWiki:Guidedtour-tour-gettingstarted-click-save-description/en

MediaWiki:Guidedtour-tour-gettingstarted-click-save-description/en
Click "Aldaketak argitaratu" and your changes will be visible.

The another message is displayed correctly:

"lqt-summarize-intro": "Please summarize the below thread in the editing box.\nYou may use any wikitext in your summary.\nWhen you finish, click \"{{int:publishpage}}\"."

https://translatewiki.net/wiki/MediaWiki:Lqt-summarize-intro/en
MediaWiki:Lqt-summarize-intro/en
Please summarize the below thread in the editing box. You may use any wikitext in your summary. When you finish, click "Publish page".

In T164771#4599835, @Etonkovidova wrote:

@SBisson why the following messages have ""Aldaketak argitaratu"" text (it's Basque) ? "Aldaketak argitaratu" will be displayed for any language .

It turns out there was an incorrect local translation of publishchanges on translatewiki.net. @Nikerabbit fixed it.

Also, be aware that {{int:publishchanges}} will be rendered using your interface language on TWN so that can be different than the language of the message you are looking at but that's ok.