Release 3.19.3
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* Adapt code for gspell API changes
* Adapt code to support again loading and saving remote files
* Better gnome-shell integration: add an application menu and fix the
  "Open a New Window" right-click action
* Make LaTeXila D-Bus activatable
* Change "Unsaved Document" to "Untitled Document"
* Other various small code improvements
* Translation updates