This change makes TranslatableComponent still scan a
translation string for placeholders, even if the translation string
itself is being used (rather than a value found from the
ResourceBundle). This matches vanilla behavior and allows plugins that
use this system with serverside translations and other custom
translation systems to send output to the server console correctly.
This method is simple: it resets the current part to default settings, keeping only the current text. It therefore acts like the old ChatColor.RESET
code. The retain method allows for more control over what is reset.
Add a test to verify proper functioning of reset()/retain().
