[openstreetmap/openstreetmap-website] Authenticating the maps desktop app fails (Issue #5409)

[Alexander Lazarević via rails-dev]

### URL

_No response_

### How to reproduce the issue?

1. Open maps on the desktop (manjaro, gnome). Select "Setup OpenStreetMap 
Account..." In the "three dots menu" 
2. Select to sign in on OpenStreetMap
3. Authorize the access (my account is in German, so the dialog language is 
that)
4. This yields in an Application error 

### Screenshot(s) or anything else?

![Screenshot From 2024-12-17 
11-54-42](https://github.com/user-attachments/assets/7d52caa0-1bc7-4bab-9c0e-92d471c29e3c)

![Screenshot From 2024-12-17 
11-51-18](https://github.com/user-attachments/assets/3253c3c8-d548-43ec-bfad-c17a36cfd032)

![Screenshot From 2024-12-17 
11-51-40](https://github.com/user-attachments/assets/f32233e0-6307-4279-ad7c-0ea18100e11e)

![Screenshot From 2024-12-17 
11-52-10](https://github.com/user-attachments/assets/11b1d54c-f8cf-4a75-8b20-025edf195987)

![Screenshot From 2024-12-17 
11-53-02](https://github.com/user-attachments/assets/2ed65d20-e06f-4673-aecc-c881c727c268)

![Screenshot From 2024-12-17 
12-02-37](https://github.com/user-attachments/assets/1cb765ca-2a7a-47de-ac69-6aed52c49036)

```
POST /oauth2/authorize HTTP/2
Host: www.openstreetmap.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 
Firefox/133.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br, zstd
Referer: 
https://www.openstreetmap.org/oauth2/authorize?scope=read_prefs+write_api&code_challenge_method=S256&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob&client_id=ATOMKAKOXQuAJYpFxkm__nDVRlJLXXmP-0P54UfDnZI&state=pNsj%7EQ%7EclM&response_type=code&code_challenge=m9aesZKh1NAMELUL9fTwM3B4z_3DkNEYPGg456GL7KE
Content-Type: application/x-www-form-urlencoded
Content-Length: 388
Origin: https://www.openstreetmap.org
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Cookie: ****
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Priority: u=0, i
```


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