Fuzzy voice matching

strings/en.json

@@ -6,6 +6,7 @@
 	"USER_VOICE_CHANGED": "Your new voice is %s from %s",
 	"INVALID_ENGINE": "%s is not a valid engine name.",
 	"INVALID_VOICE": "invalid voice name. Using default voice %s for %s instead.",
+	"AMBIGUOUS_VOICE": "voice name \"%s\" is ambiguous. Candidates: %s",
 	"TOO_MANY_ARGUMENTS": "too many arguments for command.",
 	"CURRENT_STORY": "Here's the current story: %s",
 	"NO_STORY": "No story in progress at the moment.",