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The default layouts include the following languages: Italian, German, English, French, Dutch.
Invoice texts are printed in the customer's language, provided that this is set in the Language column (Accounts table, Address view).
The language is an ISO code generally of 2 lowercase letters (it=italian, de=german, en=english, fr=french, nl=dutch).
In acse no language has been indicated for the customer account, the language of the accounting is used, defined in the File menu→ File and accounting properties (basic data) → Other.