Overview of changes in gcalctool 5.28.1

    * Fix numeric exponent parsing (Robin Sonefors, Bug #596892)

    * Handle ',' as radix point when editing display (Robert Ancell)

    * Fix inactive random button (Robert Ancell)

    * Updated documentation: el (Jennie Petoumenou)

    * Updated translations: ca (Joan Duran), el (Kostas Papadimas)
                            et (Ivar Smolin), ro (Lucian Adrian Grijincu)
                            ru (vicanis@gmail.com), sl (Matej Urbančič)