Please see http://www.flashfxp.com/languages for more information. When you are done with your translation and ready to upload, simply select your language from the list...if it is not on the list, send an email to support @ inicom.net and we will add it for you.
eagle25, thanks for your post. Unfortunately, i have refused it for now because this file causes FlashFXP to crash when entering preferences. (search the forum for the problem as a few other translators ran into it). Looks like you might have missed some crucial translation pieces. This also appears to be an incomplete translation as the preference window tree items are not translated. Please resubmit once you have fully tested it.