adding gatsby-plugin-i18n-tags

[kalwalt]

Basically i want to add tags support for different languages. I'm using the gatsby-plugin-i18n-tags.

[kalwalt]

the issue with image as posted in angeloocana/gatsby-plugin-i18n#63 is solved upgrading the packages with Yarn: running yarn upgrade, though i have another issue with graphQL schema but i think i can solve it.

[kalwalt]

Next step is to modify the Layout component. Basically it was failing because i was retriving the data with a wrong GraphQL query.

[kalwalt]

due to the latest changes and re-changes the warning:

React-Hot-Loader: react-🔥-dom patch is not detected. React 16.6+ features may not work.

pop up again; as a note for the future i must remember this two references:

gatsbyjs/gatsby#11934 and the rreact-dom @hot-loader https://github.com/gaearon/react-hot-loader/tree/7089062eac273832102c074a368d5af27e23e0b0#react--dom

[kalwalt]

production build fails and in develop i get lot of this kind of errors:

Error: A plugin tried to update a node field that it doesn't own:
  Node id: 39b35ac4-9bce-5166-87d4-328da09469d8
  Plugin: default-site-plugin
  name: slug
  value: /tags/index.it/

This error happened in the past but i don't remember how i solved... i will look into it in the next days...

[kalwalt]

Now i had to improve the css styling and the retrieve list of the blog posts.

[kalwalt]

In allTags page for the tag, in the footer langKey is always en, that is wrong because when in the italian page should be it... I'm investigating it. Not ready to be merged yet....

[kalwalt]

Now i can merge it!