- reset locale when saving the config

diff --git a/src/lingot-config.c b/src/lingot-config.c
index a46e372..9886ac8 100644
--- a/src/lingot-config.c
+++ b/src/lingot-config.c
@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <math.h>
+#include <locale.h>

 #include "lingot-config.h"
 #include "lingot-mainframe.h"
@@ -139,6 +140,12 @@ void lingot_config_save(LingotConfig* config, char* filename)
   {
     unsigned int i;
     FILE* fp;
+    char* lc_all;
+
+    lc_all = setlocale(LC_ALL, NULL);
+// duplicate the string, as the next call to setlocale will destroy it
+    if (lc_all) lc_all = strdup(lc_all);
+    setlocale(LC_ALL, "POSIX");

     if ((fp = fopen(filename, "w")) == NULL)
       {
@@ -166,6 +173,11 @@ void lingot_config_save(LingotConfig* config, char* filename)
         }

     fclose(fp);
+
+    if (lc_all) {
+        setlocale(LC_ALL, lc_all);
+        free(lc_all);
+    }
   }

 //----------------------------------------------------------------------------