Fix handling of an unset language override.

Add setting to example.ini.

r2/example.ini

@@ -70,6 +70,7 @@ page_cache_time = 90
 locale = C
 # default site language (two letter character code)
 lang = en
+lang_override =
 # if your webserver is a proxy and on a different instance, use
 # X-forwarded-for and set this to the webserver's IP
 proxy_addr = 

r2/r2/controllers/reddit_base.py

@@ -364,7 +364,7 @@ def set_iface_lang():
     else:
         lang = [c.user.pref_lang]
 
-    if hasattr(g, "lang_override") and lang[0] == "en":
+    if getattr(g, "lang_override") and lang[0] == "en":
         lang.insert(0, g.lang_override)
 
     #choose the first language