Updated CI to use "npm" instead of yarn for the frontend project based
on @manuhabitela's recommendations. Also updated the dependencies-related CI
steps that were previously missed.

Fixed a typo and ensured all instances of "crowdin"
are capitalized for consistent naming.

- dynamically load locale files for smaller footprint
- have a namespace for each feature. At first I'd figured I'd put each
namespace in its correct feature folder but it's kinda cumbersome to
manage if we want to link that to i18n management services like crowdin…

the base path is actually not a secret so we'd rather have it outside
secrets and see it easily

- upload local translation files on push
- make crowdin create a pull request when new translations are made
through the crowdin website (webhook configured on crowdin-end)

makes more sense i guess, maybe