fix taxonomy & multilingual typo (#177)

* fix taxonomy & multilingual typo

* use better fix

https://github.com/luizdepra/hugo-coder/pull/177#discussion_r280132097

exampleSite/config.toml

@@ -43,7 +43,9 @@ disqusShortname = "yourdiscussshortname"
     custom_css = []
 
 [taxonomies]
+  category = "categories"
   series = "series"
+  tag = "tags"
 
 [[params.social]]
     name = "Github"