Overview of changes in gnome-calculator 3.19.91
* Fix: Check for null on variables ought to autocomplete (fixes #762426) (Alberto Ruiz)
* Updated Czech translation (Marek Černocký)
* Updated Catalan translation (Jordi Mas)
* Updated Galician translations (Fran Dieguez)
* Updated Swedish translation (Anders Jonsson)
* Updated Serbian translation (Мирослав Николић)
* Updated Brazilian Portuguese translation (Fábio Nogueira)