Did you enable Unicode within the Joomla! SEF config?

Did you enable Unicode within the Joomla! SEF config?

If so, they wouldn't be replaced at all ?

How the special characters are replaced depends on the item language and thus on the language pack. So first make sure you have the danish language pack installed and set the article to danish.
If that is already the case, you will have to contact the danish language team and see if they want to add a transliterate method to the localise.php file (I think). From what I see on Crowdin, there is currently no specific code for that. @infograf768 likely knows better how that works in detail ?

The default transliteration (when unicode is not chosen in Global config) for Joomla is
'ø' => 'o',
See https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L70

oe is the transliteration of ö
See https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L85

In the French pack we do have a custom transliteration and we use:

'o'		=>	'ò,ó,ô,õ,ø,ō,ŏ,ő,ο,ό,ω,ώ',
'oe'	=>	'œ,ö',

We don´t want to have unicode characters in URL, so we do not enable unicode alias in Global configuration.

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On 21 Mar 2018, at 08.19, infograf768 notifications@github.com wrote:

The default transliteration (when unicode is not chosen in Global config) for Joomla is
'ø' => 'o',
See https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L70 https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L70
oe is the transliteration of ö
See https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L85 https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L85
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We don´t want to have unicode characters in URL, so we do not enable unicode alias in Global configuration.

Yes this was understood

I see that the danish language file \language\da-DK\da-DK.localise.php
does not implement (does not have) public static function transliterate($string)

So this code
https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Language.php#L397-L404

	public function transliterate($string)
	{
		// THIS does NOT exist for danish language
		if ($this->transliterator !== null)
		{
			return call_user_func($this->transliterator, $string);
		}
		$string = Transliterate::utf8_latin_to_ascii($string);
		$string = StringHelper::strtolower($string);
		return $string;
	}

will just return the default,
which is Transliterate::utf8_latin_to_ascii(...)
that @infograf768 mentioned above

https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Transliterate.php#L31

This is work for danish translation team to add custom transliteration

Let me add here that you are the first one from Northern Europe to complain about the default transliteration for Latin supplement 1 since we introduced it in 1.6.
You may, if you like, override the localise.php for your language pack to get exactly what you want as the Translation Coordinators for these languages never did it as default was OK for all.

the way to do it is explained here:
https://docs.joomla.org/J3.x:Making_a_Language_Pack_for_Joomla#Example_2_-_Custom_transliteration_implemented

Therefore, just copy the existing da-DK.localise.php
Add the method above and modify it to fit your needs.

Then place the new xx-XX.localise.php in
administrator/language/overrides/ folder
and
language/overrides/ folder

in your case a da-DK.localise.php

The override is done with this code.
https://github.com/joomla/joomla-cms/blob/staging/libraries/src/Language/Language.php#L218-L230

I guess we can close this as this is not a core issue and infos have been given to override.