[FIX] conf: don't use None in language switcher

In a lang is not present in languages_names, the menu was displaying None

X-original-commit: 8b40d49

add Swedish

closes odoo/documentation#8153

X-original-commit: 2ed5e2a
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

conf.py

@@ -235,6 +235,8 @@ languages_names = {
     'it': 'IT',
     'nl': 'NL',
     'pt_BR': 'PT',
+    'ro': 'RO',
+    'sv': 'SV',
     'uk': 'UA',
     'zh_CN': 'ZH (CN)',
     'zh_TW': 'ZH (TW)'
@@ -445,7 +447,7 @@ def _generate_alternate_urls(app, pagename, templatename, context, doctree):
         """
         _current_lang = app.config.language or 'en'
         # Replace the context value by its upper-cased value ("FR" instead of "fr")
-        context['language'] = languages_names.get(_current_lang)
+        context['language'] = languages_names.get(_current_lang, _current_lang.upper())
         context['language_code'] = _current_lang
 
         # If the list of languages is not set, assume that the project has no alternate language