IMPORTANT:
This has nothing to do with the Joomla version. The following explanation is the same for 3.x or 4.x
If you do not want to use
unicode aliases but need
transliteration, the alias obtained depends on the language pack in use.
Are you using the Greek language in admin when you create these Titles?
If not, what you obtain is the default transliteration for Joomla which ONLY works for latin characters.
It deletes any non-latin glyphs and thereafter the result depend if you have or not some parts in latin alphabet in the title:
If some latin alphabet, the automatic alias will be created with these only.
If no latin alphabet, it will be the date the item is created.
If you use Greek in backend you would obtain a specific transliteration for Latin AND Greek.
The Greek pack is not available for 4.0, but you can, for test purposes, install the 3.x pack
http://joomlacode.org/gf/download/frsre ... .9.7v1.zip
Then you need to correct the el-GR.localise.php as it is not compatible with 4.0 (both in site and admin language folder)
Change line 92
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$str = JString::strtolower($string);
to
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$str = \Joomla\String\StringHelper::strtolower($string);
You will obtain as alias
"omilos-axa-isxyres-epidoseis-kai-to-a-6mino-tou-2019"
for the title
"Όμιλος ΑΧΑ: Ισχυρές επιδόσεις και το α΄ 6μηνο του 2019"
NOTE 1:
If you were using unicode aliases, a unicode url copy/paste will depend on the browser in use.
Safari: one gets utf8
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http://localhost:8888/installmulti/joomla40/en/31-όμιλος-αχα-ισχυρές-επιδόσεις-και-το-α΄-6μηνο-του-2019
Firefox and Chrome: one gets percent encodings
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http://localhost:8888/installmulti/joomla40/en/31-%CF%8C%CE%BC%CE%B9%CE%BB%CE%BF%CF%82-%CE%B1%CF%87%CE%B1-%CE%B9%CF%83%CF%87%CF%85%CF%81%CE%AD%CF%82-%CE%B5%CF%80%CE%B9%CE%B4%CF%8C%CF%83%CE%B5%CE%B9%CF%82-%CE%BA%CE%B1%CE%B9-%CF%84%CE%BF-%CE%B1%CE%84-6%CE%BC%CE%B7%CE%BD%CE%BF-%CF%84%CE%BF%CF%85-2019
Some packs, like the French language pack, do contain custom transliteration for Greek as well as Cyrillic glyphs.