Do not localize dates in pcal exports

* Do not localize the word "week" in pcal export headers.
* Reset current locale before formatting dates in pcal export data.

Addresses BUG#1.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/utils.c

@@ -488,8 +488,15 @@ date_sec2date_str (long sec, char *datefmt)
 void
 date_sec2date_fmt (long sec, const char *fmt, char *datef)
 {
+  /* TODO: Find a better way to deal with localization and strftime(). */
+  char *locale_old = mem_strdup (setlocale (LC_ALL, NULL));
+  setlocale (LC_ALL, "C");
+
   struct tm *lt = localtime ((time_t *)&sec);
   strftime (datef, BUFSIZ, fmt, lt);
+
+  setlocale (LC_ALL, locale_old);
+  mem_free (locale_old);
 }
 
 /*