Hi, I'm a Wikipedian from the Netherlands. I have a MA degree in musicology, but I am as interested in languages as I am in music. This interest made me a long time contributor to several Wikipedias in minor languages. As goes withouth saying, I would much rather write in Welsh here. Unfortunately, I don't speak Welsh or any other Celtic language.
I sometimes edit the Welsh Wikipedia. From my own experience, I know how annoying it can be if some person who doesn't speak your language comes in like an elephant in a china shop, changing things just because he feels they should be changed. Please keep your patience and don't forget I'm (ultimately) with you. I might even learn your language someday...