Here a few links to help you with your writerly* stuff:
The English/Irish Dictionary - Enter an English word into their search engine and they'll provide the Irish Gaelic translation.
Life During the Middle Ages - Learn about education, clothing, music, etc. all from Medieval times, baby... I mean, good sir (however you say that in Old/Middle English.)
Magical World Builder - It's been awhile since I've been here. Browse.
*Yes, I know that "writerly" isn't a word. Deal with it.