[ease/introspection] (17 commits) ...Merge branch 'master' into introspection

[Nate Stedman <natesm src gnome org>]

Summary of changes:

  312c2c6... Updated Brazilian Portuguese translation (*)
  a9f901f... [editor] Fixed thumbnails not redrawing. (*)
  b5d19cb... [l10n] Updated German translation (*)
  073ec47... Updated Spanish translation (*)
  9dbe3c1... [general] Fixed PDFs not persisting through a save (*)
  d58668f... [fileformat] Write backgrounds to their own JSON object (*)
  96cc7af... [general] Require all to be run for make run/db (*)
  6b5ecee... [general] Fixed some PDF element-related bugs (*)
  f1fcff8... [editor] Improved save dialog handling. (*)
  d8fb712... [editor] Tick seconds on the close confirm dialog (*)
  708ebad... [editor] Improve save dialogs again. (*)
  669c8c1... Updated Spanish translation (*)
  198d75b... Updated Spanish translation (*)
  8c812c7... [editor] Overwrite dialog is now a warning dialog (*)
  d2e511d... [general] Math function cleanup (*)
  68c0e09... Updated Spanish translation (*)
  08e956d... Merge branch 'master' into introspection

(*) This commit already existed in another branch; no separate mail sent