This PR adds support for using PHP Enums as values in the translator’s replacement array.

Right now, if an Enum is passed to the replaces array, the translator tries to treat the Enum object as a string. That causes a TypeError when mb_substr() is called. For example:

{
    "class": "TypeError",
    "message": "mb_substr(): Argument #1 ($string) must be of type string, App\\Enums\\UserStatus given",
    "file": "/vendor/laravel/framework/src/Illuminate/Support/Str.php:1718"
}

Because of:

The change updates Translator::makeReplacements() so that Enum values are converted to their underlying value before the replacement logic runs. This brings Enum handling in line with how other simple value types are treated.

Tests are included for string-backed, int-backed, and unit Enums.

No breaking changes.