bitcartcc

As we are going to implement theming support in BitcartCC store, see bitcartcc/bitcart-store#319, we need to extend the API to allow storing css url.
CSS url for the theme is just an url which will be loaded by the frontend.
Ideally in the future we will allow to host css right on the server and use a permanent link to server storage, for that #161 and file storage support should be implemented

We need to set up internalization infastructure on admin panel.
Initially, translating only checkout page is enough. Later we can translate the whole panel.
Steps to do it:

• Set up nuxt/i18n. See this commit and further ones to see how we did it for bitcartcc store
• Setup transifex resource.

Same as bitcartcc/bitcart-admin#124, but for bitcartcc store
The store doesn't have much strings to translate and the css framework itself doesn't have any strings too, so it should be trivial following examples of how it was done in BitcartCC site

Same as bitcartcc/bitcart-admin#123, but for BitcartCC Blog
Note that as the blog is not included into our releases, has netlify previews set up and is quite basic, way fewer tests are needed, just a little bit to ensure basic blog features work

Main welcome: bitcartcc/bitcart#243

Issue list:

• #3
• #4

Help us translate BitcartCC website to your language!
To do that, you need to add your language name (as to be displayed on language picker) to this file:
https://github.com/bitcartcc/bitcart-site/blob/e58631d0c61f5829896de37ff88326f7949aba2f/i18n.js#L6-L11
Note that all translations are pulled from transifex on deploy, so to edit translations you have to do so from transifex.
To localize your