The issue of foreign languages being used in spellcraft arises every once in awhile. Some practitioners believe that if you can't speak the language, you have no right to use it magically. From a respectful point of view, this fact has a flip side: if you don't speak the language, chances are good that you're going to really concentrate on what you're saying in order to get it right. Therefore, focus is greater. This works equally well for written magic. Using foreign alphabets or codes forces you to concentrate on what you're doing. If this sort of thing causes you to focus on form rather than content, then using foreign alphabets might not be for you. In that case, stick to your mother tongue.
In my own practice, I've found using mystical alphabets and language to be a powerful meditative tool. I highly recommend this tool.