We have experienced an issue connected with managing pages structure.
We have two portal sites, one uses 5 localized languages, the other one 10 lozalized languages. Both have the same problem.
The issue is that if you start to introduce names of the pages in localized versions, the site structure displays always the last language from the list. It should display the default language.
The image below will help you understand the problem. The image shows site structure, only the "Quick link" page has been translated to all langauges, but the tree shows French language (bug). It should show default language (in this case "Quick links DE", because German is default language).
The other pages are not translated, only English is introduced, so it seems there is no problem with those pages, but when you start translating, the site structure will be in French, because this is the last language in the list.
The second site has Vietnamese language as last one on the list, so the structure is displayed in Vietnamese. Administrators are not Vietnamese, so it's a big issue.