Hello.
I Have An Idea!
The Lang Support can do into the Database.
i Think this would be great
I Think following database structure ca be yoused
lang_id, lang_variable, lang_language, lang_word
now in the database you fill in
1, email, deutsch, eMail
2, email, english, email
in the /lang/YOUR_LANG/main.php
there a SQL like SELECT * FROM 4images_database WHERE lang_language = YOUR_LANG
i think that's a good idea.