Enatega Customer Application: App isn't allowing a one-letter first name during sign-up and change Validation message accordingly

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Is your feature request related to a problem? Please describe.

App isn't allowing a one-letter first name during sign-up.
Consider special cases where a single letter might be valid (e.g., some East Asian names).

Also change Validation message accordingly, under the first name field if user enters a single letter its showing a validation message Invalid First Name ! which isn't relevant to the field.

Describe the solution you'd like
The app is designed to allow one-letter first names (some cultures do have single-letter names, initials, or mononyms).
The business logic intentionally permits it for inclusivity.

Start by locating the first-name validation used during sign-up and name changes in the application. Check how one-letter names are handled and how the current “Invalid First Name !” message is selected. Done means a one-letter first name is accepted and the validation message accurately describes any remaining invalid input.

Written by the indexing model from the issue text.