URL segments (slugs) of translated pages must be updated manually (UX flaw)
When creating a new page and not set a slug it gets autogenerated.
But when translating a page the slug gets pre-filled with "translate-to-target-language-original-title" and thus is not auto-generated with teh real title on saving.
The slug field should initially be empty on a newly translated page record.
While not technically a "bug", this is a big nuisance for non-technical editors in large envorinments. The UX can be improved here by emptying the slug initially to trigger the auto-filling when no slug is entered manually.