Bugfix for Norwegian in ox.el

* ox-latex.el (org-latex-babel-language-alist): Added 'nb', 'nn', and
'no' for Norwegian.  Removed 'no-no'.

In ox.el Norwegian is given by 'no' for Norwegian, 'nb' for bokmål,
and 'nn' for nynorsk, correspond to the ISO-2 language codes.  'no-no'
is not defined in ox.el.

lisp/ox-latex.el

@@ -143,7 +143,9 @@
     ("la" . "latin")
     ("ms" . "malay")
     ("nl" . "dutch")
-    ("no-no" . "nynorsk")
+    ("nb" . "norsk")
+    ("nn" . "nynorsk")
+    ("no" . "norsk")
     ("pl" . "polish")
     ("pt" . "portuguese")
     ("ro" . "romanian")
@@ -342,7 +344,6 @@ the toc:nil option, not to those generated with #+TOC keyword."
   :group 'org-export-latex
   :type 'boolean)
 
-
 ;;;; Headline
 
 (defcustom org-latex-format-headline-function