Cleanup (#877)

* Clean translation

* Create enum for off/slow/med/fast

* Update configuration.h

* Default loop on

* Create Medium speed symbol slot

* True/False are no longer defined, move to off string + slightly smoother lerp animations

Translations/translations_def.js

@@ -142,6 +142,10 @@ var def =
 			"id": "SettingSlowChar",
 			"len": 1
 		},
+		{
+			"id": "SettingMediumChar",
+			"len": 1
+		},
 		{
 			"id": "SettingStartSolderingChar",
 			"len": 1