Add translations (WIP)

[ferni]

Languages added: danish, french, german, italian, japanese, korean, portuguese, russian, spanish.

Paste in terminal to open all langs with dev server (osx):

open http://localhost:3000/?lang=da
open http://localhost:3000/?lang=de
open http://localhost:3000/?lang=en
open http://localhost:3000/?lang=es
open http://localhost:3000/?lang=fr
open http://localhost:3000/?lang=it
open http://localhost:3000/?lang=ja
open http://localhost:3000/?lang=ko
open http://localhost:3000/?lang=pt-BR
open http://localhost:3000/?lang=ru
open http://localhost:3000/?lang=zh-CN

[codecov]

Codecov Report

Merging #177 into develop will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           develop     #177   +/-   ##
========================================
  Coverage    73.36%   73.36%           
========================================
  Files          152      152           
  Lines         2546     2546           
========================================
  Hits          1868     1868           
  Misses         678      678

Impacted Files	Coverage Δ
src/providers/LanguageProvider.js	91.3% <ø> (-0.37%)	⬇️
src/pages/Landing.js	76% <ø> (ø)	⬆️
src/languages/index.js	100% <100%> (ø)	⬆️

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