Ownership for static Message fields

[CubBossa]

Since Message objects are unmodifiable, constants like

public static final Message PREFIX = Message.message("prefix");

could match every MessageTranslator instance. A mechanism that binds these fields to a Translator to create unique translation keys would improve the work with static fields.

[CubBossa]

Possible approach is that messages are not unmodifiable at all and only hold a reference to TranslatableComponents.