Two username-related string changes in Initial Setup

[Will Thompson <wjt endlessos org>]

Hi,

I've merged a 3½-year-old patch to GNOME Initial Setup that changes two strings:

- "The username cannot start with a “-”." becomes "The username must start with a lower case letter from a-z."

- "The username should only consist of upper and lower case letters from a-z, digits and the following characters: . - _" becomes "The username should only consist of lower case letters from a-z, digits, and the following characters: - _"

– Will

https://gitlab.gnome.org/GNOME/gnome-initial-setup/-/merge_requests/30