feat: class-based languages for localization

[faustbrian]

Moves all localization logic into classes and only ships en-US by default. Paves the way for localization plugins.

[alexbarnsley]

I love it, such elegance. Such beauty. Exquisite if I may say so myself

[alexbarnsley]

loljk, i'll take a look

[codecov]

Codecov Report

Merging #1495 into develop will increase coverage by 0.25%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1495      +/-   ##
===========================================
+ Coverage    69.19%   69.45%   +0.25%     
===========================================
  Files          140      140              
  Lines         3844     3824      -20     
  Branches       800      797       -3     
===========================================
- Hits          2660     2656       -4     
+ Misses        1015     1002      -13     
+ Partials       169      166       -3

Impacted Files	Coverage Δ
src/renderer/store/modules/announcements.js	72.72% <0%> (-6.23%)	⬇️
src/renderer/i18n/index.js	100% <0%> (ø)	⬆️
src/renderer/mixins/electron.js	0% <0%> (ø)	⬆️
src/renderer/store/modules/delegate.js	61.53% <0%> (+3.53%)	⬆️
src/renderer/store/modules/transaction.js	53.33% <0%> (+7.8%)	⬆️

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