Read How to create and updated translation modules article.
A language is considered as Right-to-left if writing goes from right to left, so if the text starts from the right of the page, and continues to the left. Right to left languages are all of those with the following alphabets:
To set a language in RTL mode log in to Openbravo ERP using the System Administrator role.
Next, go to General Setup > Application > Language.
Here the language of choice can be selected from the list. Edit it and mark RTL Language checkbox