* Implement Unix username standard validations on username creation and updating.
* Remove leading underscore permissibility | Replace hardcoded username rules with a centralized USERNAME_REQUIREMENTS_TEXT for better maintainability.
* Add username requirements translations for invite and admin user creation | Replace hardcoded username requirements with localized strings in user modals
* Refactor username requirements localization
* Remove unneeded comment | Move Regex comment to validator fn
* Remove username validation utility function to keep validation responsibilities on the server | Allow onboarding flow multi-user mode username creation step to send pre-validated credentials to server.
* Enhance error handling in system endpoints by returning a JSON response with error details instead of a plain status for internal server errors.
* Update username requirement localization in AccountModal and UserSetup components to use centralized translation key.
* test enforcements
allow users to keep existing usernames without collision
* Normalize Translations (#4861)
* normalize translations
* add translations
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Co-authored-by: Timothy Carambat <rambat1010@gmail.com>
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Co-authored-by: Timothy Carambat <rambat1010@gmail.com>
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