Whether this gambit can be used by the actor.
This is the server standardised filter key for this gambit. The filter key must not be localized.
This is the method to transform a filter into a gambit format. The gambit format can be localized.
This is the method to transform a gambit into a filter format.
The hardcoded English keyword(s) for this gambit, used as a canonical alias so that English always works regardless of the active locale. Defaults to key(), which is correct when the gambit is not translated. Override this in subclasses that translate key() via the translator.