Refactoring: step 1

druid.lua:
- `factory` replaced with `self`
- set new name for metatable
- replaced `ipairs` with `for `i loop

data.lua:
- renamed custom messages

druid/base/text.lua

@@ -4,7 +4,7 @@ local helper = require("druid.helper")
 
 local M = {}
 M.interest = {
-	data.TRANSLATABLE,
+	data.ON_CHANGE_LANGUAGE,
 }