[gnome-mines] Fix Spanish translation header

[Piotr Drąg <piotrdrag src gnome org>]

commit 1964b5b97a56f2995740dc7f24f894284c0f75cb
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Feb 24 00:15:14 2018 +0100

    Fix Spanish translation header

 help/es/es.po |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/es/es.po b/help/es/es.po
index 7ccdd33..9891513 100644
--- a/help/es/es.po
+++ b/help/es/es.po
@@ -2,7 +2,7 @@
 # translation of gnomine manual to Spanish
 # Jorge González <jorgegonz svn gnome org>, 2007, 2008, 2011.
 # 
-# Daniel Mustieles <daniel mustieles gmail com>, 2012, 2013, 2014, 2015., 2017, 2018.
+# Daniel Mustieles <daniel mustieles gmail com>, 2012-2015, 2017, 2018.
 #
 msgid ""
 msgstr ""