The plugin (widget) displays the current (and optionally tomorrow's) name-day(s).
Basically WP_LANG happening in the language specified by the display name-days, but for multilingual sites supported in Query Mode (? lang = en) and Pre-Path Mode, too.
The greeting message is changeable. In this case, and if there isn't .po file for the language of the GoogleTranslate by means of the translation. You can set the color of text in Nameday -> Nameday menu More name-day event bubble will appear on name days. ... place your cursor on it!
Installed name-days are: Hungarian, Austrian, German, French, Swedish, Italian, English, Spanish, Polish, Czech and Slovak.