Syncing docs to grab --reversesort option's docs

docs/gl_ES.UTF-8/OPTIONS.txt

@@ -1039,6 +1039,16 @@ Gardar
              or "noautosave=yes". In both cases, may be overridden by the
              command-line option "--noautosave".
 
+     reversesort=yes
+
+             This reverses the sorting of the Open and Slideshow dialogs,
+             placing the newest images at the top of the list.
+
+             ⚙ Note: If used in a system-wide configuration file, may be
+             overridden by the user's configuration file using
+             "reversesort=no" or "noreversesort=yes". In both cases, may be
+             overridden by the command-line option "--noreversesort".
+
 Data
 
   Lockfile
@@ -1460,6 +1470,7 @@ Joystick
      --saveovernew
      --nosave
      --autosave
+     --reversesort
      --lang IDIOMA
      --colorfile FICHEIRO
 
@@ -1502,6 +1513,7 @@ Joystick
      --saveoverask
      --save
      --noautosave
+     --noreversesort
 
              Estas opcións pódense usar para anular calquera axuste feito no
              ficheiro de configuración. (Se a opción non está configurada