[evince] shell: Add meaningful description in about dialog

[Germán Poo-Caamaño <gpoo src gnome org>]

commit c1a7966cbabcbe2d4c2e07463278966199e96b54
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Mon Jun 22 02:16:51 2020 -0400

    shell: Add meaningful description in about dialog
    
      * Describe the purpose of the application
      * Connect Evince and Document Viewer
      * Update the years in the copyright line
    
    Fixes #1418

 shell/ev-window.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/shell/ev-window.c b/shell/ev-window.c
index 6c8919ed..53ed9660 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -4059,10 +4059,10 @@ ev_window_cmd_about (GSimpleAction *action,
         gtk_show_about_dialog (GTK_WINDOW (ev_window),
                                "name", _("Evince"),
                                "version", VERSION,
-                               "copyright", _("© 1996–2017 The Evince authors"),
+                               "copyright", _("© 1996–2020 The Evince authors"),
                                "license-type", GTK_LICENSE_GPL_2_0,
                                "website", "https://wiki.gnome.org/Apps/Evince";,
-                               "comments", _("Document Viewer"),
+                               "comments", _("Evince is a simple document viewer for GNOME"),
                                "authors", authors,
                                "documenters", documenters,
                                "translator-credits", _("translator-credits"),