) When I was looking to translate a quote for a tattoo I found this site http://www.irishgaelictranslator.com The people have varying ranges of fluency, but they will check any translation you've gotten, or simply straight up translate something for you. It is only Irish Gaelic as far as I can tell, but they might be able to tell you where to find a Scots Gaelic translation site! If you have a quote or saying, and are wondering how to pronounce it you can go here and the site will actually read it out loud to you. (It does do it with an Ulster accent, if that matters to you.) http://www.abair.tcd.ie/index.php?page=synthesis&lang=engAnd, finally, if you would like to see how your Irish Gaelic quote would look in Gaelic script you can go here http://www.ellipsix.net/textwriter/render.html and choose Bunchlo GC or Bunchlo Arsa GC to render it. (The site honestly only works spottily, on the Irish Gaelic Translation Forum there are links to downloading Gaelic fonts to use on your computer. Enjoy!
(I am not in any way commercially associated with any of these sites, I'm just another Celtophile who has been hunting down resources to design a very special tattoo.)