Hi it seams to be something broken in the el-GR language pack? Can you check the XML and share it with us?

The issue is in the language pack of the Greece language
@nikosdion you are listed on https://community.joomla.org/translations/joomla-3-translations.html#el-gr as Coordinator could you have a look?

The contact person for that is Aris Ntatsis. I’ve not been an active Greek language maintainer for quite a while. You can contact the current maintainers either though Joomla.gr or from the CrowdIn page for the Greek translation. If you can’t seem to be able to reach anyone give me a holler and I’ll email them directly.

@WhiteSymmetry Do you use the latest Greece language pack 3.9.17? If not please update your language pack, try again and report back the result here. Thanks in advance.

@nikosdion thanks for the info so the cjo has an old entry

At least two to three years out of date :)

Just talked to Aris. He will check/correct in 30 minutes

There was an error at administaror/language/el-GR/el-GR.xml file.
It is corrected and a new package el-GR_joomla_lang_full_3.9.17v2.zip has been uploaded @ joomlacode

Thanks @ntatsis closing here as the issue has been solved

Hi. I've installed the Greek language right on Joomla installation, along with several other languages I want to promote the website. The Greek language does not show in Content Languages. Even stranger, some other languages do not on show in Content Languages, I mean languages that otherwise, in other Joomla installations, used to show in Content Languages directly. So would anyone please provide the values I have to put in the Details fields as I have to manually add the Greek language?

@svdumitrescu As far as I know there is no Joomla 4 release of the Greek language pack — or at least that was the case until three days ago when I last checked. I am no longer a member of the Greek translation team and CrowdIn seems to not know who I am (probably my account was linked to a Facebook account I've closed a year or two ago). Best contact the Greek translation team in the Joomla forum to ask when is the planned release for a 4.0 lang pack.

@nikosdion :: My installation currently updated says Joomla! 3.9.28. And I suppose the Content Language Details won't change with Joomla's next version. So I'm talking about those variables Title, Title Native, Language Tag etc. What are the Greek values to fill in those fields, please?

@nikosdion :: Don't mind anymore, thanks anyway. I installed another fresh site, checked only Greek as additional language and the Content Languages updated succesfully all alone. (Then I copied the values from one site to another)

I was about to say. I installed a fresh Joomla 3.9 site, Greek was installed just fine and the content languages were there just fine too. I guess the install partially failed on the first site?

@nikosdion :: Right. And what's strange, it happens frequently. I check say 4-5 languages and only 2 of them have the Content Languages Details filled in. I guess somewhere on the servers may be some problems. Thanks for your time.