> As a non-English speaker I can really relate to this.I think the real mistake was Apple allowing to enter a non-ASCII password in the first place.

As a non-English speaker (Czech, actually), it is clear to me to not use non-ASCII characters in passwords, or generally not use characters that are at different position on default English keyboard and locally used keyboards, i.e. use only ASCII alphanumeric chars except 'Y' and 'Z'.

As keyboard setting is per-user setting, keyboard may be different on login screen than on regular desktop (and once-login password prompts).