Log Message:
Update to 5.26.2:

Overview of changes in gcalctool 5.26.2

    * Remove negative sign from numbers rounded to zero.  This is
      only a partial fix as the error value is still visible in
      scientific notation (Robert Ancell, Bug #560802)

    * Support odd roots of negative numbers (Robert Ancell, Bug
      #576973)

    * Keep settings (show zeroes, thousands separator etc) when
      changing modes (Robert Ancell, Bug #580398)

    * Fix missing license text in about dialog (Robert Ancell, Bug
    #579174)

    * Updated documentation: el (Jennie Petoumenou)

    * Updated translations: el (Jennie Petoumenou), es (Jorge
      Gonzalez)