Merge branch 'master' into baguette

CHANGES.txt

@@ -17,8 +17,10 @@ Features
 Bugfixes
 --------
 
-* Save dependencies for template hooks properly (using .__doc__ or
-  .template_registry_identifier for callables)
+* Use ``locale.getdefaultlocale()`` for better locale guessing
+  (credit: @madduck)
+* Save dependencies for template hooks properly (using ``.__doc__`` or
+  ``.template_registry_identifier`` for callables)
 * Enable larger panorama thumbnails (Issue #2780)
 * Disable ``archive_rss`` link handler, which was useless because no
   such RSS was ever generated (Issue #2783)

nikola/nikola.py

@@ -2817,6 +2817,17 @@ def guess_locale_from_lang_posix(lang):
     if is_valid_locale(str(lang)):
         locale_n = str(lang)
     else:
+        # Guess using locale.getdefaultlocale()
+        try:
+            # str() is the default string type: bytes on py2, unicode on py3
+            # only that type is accepted by the locale module
+            locale_n = str('.'.join(locale.getdefaultlocale()))
+        except (ValueError, TypeError):
+            pass
+        # Use guess only if it’s the same language
+        if not locale_n.startswith(lang.lower()):
+            locale_n = str()
+    if not locale_n or not is_valid_locale(locale_n):
         # this works in Travis when locale support set by Travis suggestion
         locale_n = str((locale.normalize(lang).split('.')[0]) + '.UTF-8')
     if not is_valid_locale(locale_n):