Industrialize the i18n workflow

Following the awesome work done by @Bat in !125 (merged) (related issue: #5 (closed)) on enabling i18n in our front-end, we should think about making the whole thing automated and usable for external translators:

• Write documentation
• Setup a translation tool (like weblate)
• Setup the CI jobs to push to weblate
• Setup the wrapper script to pull translations and bundle them with the artifacts