Password mask does not work on emojis (/epsilon)

[i-report-bugs]

Emojis are not being masked properly in the password field on /epsilon

[gcsolaroli]

This problem also exists in the current version.
We are "maskinig" password values using a custom font, but we do not know how to set the "⚫️" symbol for all characters; so we have set it for most of the characters, but UTF8 has too many possible values to be exhaustively listed.
If anyone has an idea on how to define a font specifying a symbol for each possible character, we would be grand. 🙂