Umbraco

🚨 [Breaking change]: Remove the built-in Bootstrap 3 horizontal forms theme from Umbraco Forms

Umbraco Forms 19 removes the bootstrap3-horizontal theme, which was incompatible with Bootstrap 4 and 5, as Bootstrap 3 reached end-of-life in July 2019. Developers are advised to create custom themes for their Bootstrap versions. The change reduces maintenance and avoids misleading developers regarding theme compatibility.