When clicking on the More side-bar option, "Historial de converses" (Conversation History) is displayed in Catalan. Catalan is another keyboard language I use, and prior to this test, it was the Windows display language. Even though after restarting the computer, this string was still displayed in Catalan.
1. Open the Mail app. 2. Click on More.
Historial de converses
Historial de conversaciones
Reason for change
This seems like a functional issue or a weird behaviour on my side.