Refactor echo functionality: add new echo implementation, remove deprecated echo?b1 file, and update preparation script

com/echo.lua

@@ -0,0 +1,13 @@
+--- #description = "Echoes back the message provided in the 'msg' parameter."
+
+local mod = require("_for_echo")
+
+if not Params.msg then
+    Result.status = "error"
+    Result.error = "Missing parameter: msg"
+    return
+end
+
+Result.status = "ok"
+Result.answer = mod.translate(Params.msg)
+return