[latexila] spell: use gspell_language_get_default()

[Sébastien Wilmet <swilmet src gnome org>]

commit cd6a9f8f7d0be0f27d06032522a3c132c2c8e533
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Jan 14 13:26:30 2016 +0100

    spell: use gspell_language_get_default()

 src/preferences_dialog.vala |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/preferences_dialog.vala b/src/preferences_dialog.vala
index 4c7be51..1677997 100644
--- a/src/preferences_dialog.vala
+++ b/src/preferences_dialog.vala
@@ -335,8 +335,10 @@ public class PreferencesDialog : Dialog
         if (lang_code[0] != '\0')
             lang = Gspell.Language.lookup (lang_code);
 
-        Gspell.Checker checker = new Gspell.Checker (lang);
-        spell_language_button.set_language (checker.get_language ());
+        if (lang == null)
+            lang = Gspell.Language.get_default ();
+
+        spell_language_button.set_language (lang);
     }
 
     private void init_other_tab (Builder builder)