As you may know persian has a right to left writing. When I try to type in Abiword in English and persian Combined,English words have been reversed. Hear is a sample: It types " utnubuL سیستم عامل xuniL می توان" When I want to type " Lubuntu سیستم عامل Linux می توان".This problem remains even when I first complete the persian text and then try to add English words. My operating system is Lubuntu 14.04.
Here is an old article on the bi-directionality of AbiWord. It explains how to create bi-directional documents using AbiWord. I believe that it may assist you in solving your problem.