[iagno] Created tag 3.31.91

[Arnaud B. <arnaudb src gnome org>]

The unsigned tag '3.31.91' was created.

Tagger: Arnaud Bonatti <arnaud bonatti gmail com>
Date: 1550665068 +0100

    Release 3.31.91.

Changes since the last tag '3.31.90':

Anders Jonsson (2):
      Update Swedish translation
      Update Swedish translation

Arnaud Bonatti (28):
      Compile with --experimental-non-null.
      Add aliases to command-line level.
      Do not notify when unneeded.
      Delay when changing settings.
      Use internal, not public.
      Use assert_true in tests.
      Improve code.
      Make final animation reliable.
      Use uint8 when possible.
      Prefer blue theme with Adwaita-dark.
      Bump Gtk required version.
      Improve drawing code.
      Improve final animation code.
      Style.
      Allow to see end position.
      Be smarter for first highlight.
      Clear highlight on undo.
      Improve finish code.
      Improve redraw call code.
      Be strict in Player.
      Little focus fix.
      Little highlight fix.
      Add translators comments.
      Map Ctrl-Z to back action.
      Various code fixes.
      Fix final animation bug.
      Improve AI code.
      Prepare 3.31.91.

Balázs Úr (2):
      Update Hungarian translation
      Update Hungarian translation

Daniel Mustieles (2):
      Updated Spanish translation
      Updated Spanish translation

Daniel Șerbănescu (1):
      Update Romanian translation

Emin Tufan Çetin (1):
      Update Turkish translation

Fabio Tomat (1):
      Update Friulian translation

Fran Dieguez (2):
      Update Galician translation
      Update Galician translation

Jiri Grönroos (1):
      Update Finnish translation

Jordi Mas (1):
      Update Catalan translation

Kukuh Syafaat (2):
      Update Indonesian translation
      Update Indonesian translation

Marek Cernocky (2):
      Updated Czech translation
      Updated Czech translation

Matej Urbančič (2):
      Updated Slovenian translation
      Updated Slovenian translation

Piotr Drąg (2):
      Update Polish translation
      Update Polish translation

Sabri Ünal (1):
      Update Turkish translation

Yi-Jyun Pan (1):
      Update Chinese (Taiwan) translation