[openstreetmap/openstreetmap-website] Cannot calculate any directions – Uncaught TypeError: OSM.i18n.currentLocale is not a function (Issue #5821)

[Openstreetmapler]

Openstreetmapler created an issue (openstreetmap/openstreetmap-website#5821)

### URL

https://www.openstreetmap.org/directions?engine=fossgis_valhalla_car&route=42.038752%2C13.626598%3B42.038752%2C13.626598#map=19/42.038804/13.627943

### How to reproduce the issue?

Go to the above URL. The route will never be calculated and there’s an endless loading spinner.

### Screenshot(s) or anything else?

Error in the browser console:
```
17:23:32.586 Uncaught TypeError: OSM.i18n.currentLocale is not a function
    getRoute https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9
    s https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:8
    y https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9
    setValue https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:8
    d https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9
    load https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9
    run https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9
    load https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9
    <anonymous> https://www.openstreetmap.org/assets/index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:1
    u https://www.openstreetmap.org/assets/application-819d5ef9c9be076fee37756c270ec7ab72d539c4e87c6a55121841d48df2e845.js:12
    d https://www.openstreetmap.org/assets/application-819d5ef9c9be076fee37756c270ec7ab72d539c4e87c6a55121841d48df2e845.js:12
index-fb5318a386ef84e62dbd686715e843ad6afc2cb94d8c1c31114220032f53d736.js:9:8703
```

This JavaScript crash prevents the fetch-route code from executing, as there’s never a network request sent for getting directions.

As the missing function is called `currentLocale`, I tried [changing the language of my OSM account](https://www.openstreetmap.org/preferences) from German to English, to no avail.

Yesterday (18 March 2025, 18:00 UTC), it worked fine, but today (19 March, 16:20 UTC), it’s broken. A recent commit might have broken something, so please review them one more time. **Please do it quickly!**

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