The plugin displays only 2 letters for the abbreviations of quarters (N, NE, E, SE, S, SW, W, NW) but in hungarian language we use a 3 letters abbreviation for NW and SW (it's ÉNy and DNy). The plugin displays Éy and Dy instead of ÉNy and DNy. Thank You very much in advance if You fix this minor issue.
This may be a problem with the old translation function. If it is, the wind direction in the tooltip should be translated correctly (but I'm not sure). I'll replace all calls to it with the new version that gets the direction name from the degrees value and that should fix the problem.
Fixed in http://git.xfce.org/panel-plugins/xfce4-weather-plugin/commit/?id=9be059f8f814bb5b78081b8b2c5303cdb95b2a70.