This happens because the default language in File- Options - Language Pairs is different than the one on your project.
If you will be using all the time Arabic - English, as a temporary workaround, please go to the main menu File -> Options -> Language Pairs and add Arabic - English as your first default language pair.
This happens because the default language in File- Options - Language Pairs is different than the one on your project.
If you will be using all the time Arabic - English, as a temporary workaround, please go to the main menu File -> Options -> Language Pairs and add Arabic - English as your first default language pair.