Update _config.yml

_config.yml

@@ -26,6 +26,8 @@ description: >- # this means to ignore newlines until "baseurl:"
 baseurl: "" # the subpath of your site, e.g. /blog
 github_username:  lpawela
 
+lang: pl
+
 # Exclude from processing.
 # The following items will not be processed, by default.
 # Any item listed under the `exclude:` key here will be automatically added to
@@ -45,4 +47,4 @@ github_username:  lpawela
 #   - vendor/cache/
 #   - vendor/gems/
 #   - vendor/ruby/
-images: '/assets/images'
+images: '/assets/images'