When using Proton Pass or SimpleLogin to generate aliases, you cannot select the language of the part of the alias generated by the system. Problem: not all possible recipients are familiar with it and that increases the challenges when communicating the alias, especially verbally, with the risk of typos by customer service agents.
Problem: let the user select the language for the alias at the time of the alias creation.
SimpleLogin: an option on the button Custom Alias, like the "By random words" on the Random Alias.
Proton Pass: an option in New Alias > Advanced Settings