Faulty substitution of German umlauts in slugs and keywords

[spielautomat4]

Just submitted #53682 because handling of keywords seemed odd.

In addition to that I just noticed that German umlauts in post slugs and new keywords are no longer substituted correctly. When using "ü" in a post title, for example, the letter used to be replaced by "ue" in the slug (which is correct from a grammatical standpoint).

There are a lot of old posts in my blog that proof, this was done correctly in the past. With the latest WordPress 5.7.2, however, German umlauts are no longer replaced by "ue", "oe" or "ae". Instead WordPress now uses "u", "o" or "a" for substitution (which is not correct).

This also applies to "ß" being replaced by "ss" (now only "s").

Not sure, though, if this change was a design decision or is a bug.

[audrasjb]

Hello and thank you for opening this ticket @spielautomat4,

What is the locale of your website?
Are you using any translation/multilingual plugin?

If you website uses the de_DE locale, it should convert ß to ss and ä to ae.

Here is the related source code of remove_accent() function in 5.7.2: https://core.trac.wordpress.org/browser/tags/5.7.2/src/wp-includes/formatting.php#L1922

        // Used for locale-specific rules.
        $locale = get_locale();
 
        if ( in_array( $locale, array( 'de_DE', 'de_DE_formal', 'de_CH', 'de_CH_informal', 'de_AT' ), true ) ) {
            $chars['Ä'] = 'Ae';
            $chars['ä'] = 'ae';
            $chars['Ö'] = 'Oe';
            $chars['ö'] = 'oe';
            $chars['Ü'] = 'Ue';
            $chars['ü'] = 'ue';
            $chars['ß'] = 'ss';

[Presskopp]

Bug confirmed (5.8-RC4-51447, de_DE)

[Presskopp]

related #53682

[audrasjb]

That's very strange. I can't reproduce this on my side:

• using WordPress 5.8 RC 4
• switching to de_DE
• new post
• post title: Test permalinkß deutsch
• hit "Publish" button
• result: http://localhost/2021/07/18/test-permalinkss-deutsch/

Looks good to me 🤨

[audrasjb]

Ah. I was using the block editor.

[audrasjb]

Looks good with Classic Editor as well

[audrasjb]

In buesserhemd.png I think we have the desired behavior: ß is replaced with s because you're not on a Deutsch WordPress installation

[Presskopp]

looks like I accidentally posted a screenshot using an english environment, my bad. Still there's some kind of issue, which looks to appear only temporal after all I can say atm.

[spielautomat4]

My bad, in this case I did indeed observe this behaviour on an en_US installation. With the language set to de_DE, the substitution of German umlauts is as desired for post slugs.

I think we can close this ticket. I was not aware of the fact that the handling is different based on the installation's language. Sorry for any trouble caused.

The other issue that I reported in #53682, however, still remains. Even with de_DE.

[audrasjb]

Thank you for the confirmation, @spielautomat4!

Closing as worksforme.