Added Welsh language to supported languages table

Author: bolt-io

articles/active-directory-b2c/language-customization.md

@@ -472,7 +472,7 @@ Chrome and Firefox both request for their set language. If it's a supported lang
 
 ## Supported languages
 
-Azure AD B2C includes support for the following languages. User flow languages are provided by Azure AD B2C. The multi-factor authentication (MFA) notification languages are provided by [Azure AD MFA](../active-directory/authentication/concept-mfa-howitworks.md).
+Azure AD B2C includes support for the following languages using ISO 639-1 codes. User flow languages are provided by Azure AD B2C. The multi-factor authentication (MFA) notification languages are provided by [Azure AD MFA](../active-directory/authentication/concept-mfa-howitworks.md).
 
 | Language              | Language code | User flows         | MFA notifications  |
 |-----------------------| :-----------: | :----------------: | :----------------: |
@@ -527,6 +527,7 @@ Azure AD B2C includes support for the following languages. User flow languages a
 | Turkish               | tr            | ![Green check mark.](./media/user-flow-language-customization/yes.png) | ![Green check mark.](./media/user-flow-language-customization/yes.png) |
 | Ukrainian             | uk            | ![X indicating no.](./media/user-flow-language-customization/no.png) | ![Green check mark.](./media/user-flow-language-customization/yes.png) |
 | Vietnamese            | vi            | ![X indicating no.](./media/user-flow-language-customization/no.png) | ![Green check mark.](./media/user-flow-language-customization/yes.png) |
+| Welsh            | cy            | ![X indicating no.](./media/user-flow-language-customization/no.png) | ![X indicating no.](./media/user-flow-language-customization/no.png) |
 | Chinese - Simplified  | zh-hans       | ![Green check mark.](./media/user-flow-language-customization/yes.png) | ![Green check mark.](./media/user-flow-language-customization/yes.png) |
 | Chinese - Traditional | zh-hant       | ![Green check mark.](./media/user-flow-language-customization/yes.png) | ![Green check mark.](./media/user-flow-language-customization/yes.png) |