[PATCH] sphinx: change default language to 'en'

[Martin Liška]

Fixes the following Sphinx warning (treated as error) starting
with 5.0 release:

Warning, treated as error:
Invalid configuration value found: 'language = None'. Update your configuration 
to a valid langauge code. Falling back to 'en' (English).

Signed-off-by: Martin Liska <mliska@suse.cz>
---
 docs/conf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/conf.py b/docs/conf.py
index 49dab44cca..e33cf3d381 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -126,7 +126,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = 'en'
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
-- 
2.36.1