Implement a continuous localization process using Mojito

[patcon]

Re-ticketed from #320

Note: "repo" is also the term used by Mojito for a store of translated strings. I'll try to use the term "project" to distinguish it from a git repo.

Summary of changes

• Stood up a Mojito translation server that this PR depends on: https://polis-translations.herokuapp.com/
  • codebase used for deploying/managing: https://github.com/patcon/polis-translations
• removed some old, unused strings (assumed English was gold-standard)
• added an on: push workflow to push new strings from default en.js locale on dev branch, pushing to the Mojito server
  • For example, see demo string in Mojito interface pushed from en.js change
• added an on: schedule workflow to regularly PULL newly translated strings from Mojito, and initiate a PR against dev if necessary (see Update translations patcon/polis#15, though slightly outdated)

To Do

• stand up mojito server on Heroku
• cleanup existing strings
• write workflows for pushing and pull strings between git repo and mojito server
• write sufficient docs on managing Mojito server
  • adding a new translation project (e.g. client-admin)
  • adding new locales to a project
  • adding support for a new locale to mojito itself (beyond 154 currently supported locales) wontdo
  • changing the admin password used for CLI
  • ...
• add team polis (@metasoarous) to polis-translations Heroku app
  • re-assign ownership
• transfer patcon/polis-translations repo to team polis
• stretch goal: set up github action workflow to store DB backups as git repo artefacts (see context below in issue)
• update translation project/repo name from polis to polis:client-participation
• added polis:client-admin translation project
  • cleaned up files
  • imported existing portugese translation into system
  • extract i18n code from participation into admin
• change admin password on Mojito server
• decide consistent term to use in docs: "translation" or "localization"
• set MOJITO_CLI_PASSWORD secret on upstream repo
• accept pre-merge inline suggestions in PR

[patcon]

Changed workflows so that maintenance tasks (like adding a new translation project, or a new locale) can be done simply by modifying workflow files. Added docs to clarifying steps for doing these commons tasks.

Resolved merge conflicts and ready to move forward with review and merge 🎉

[patcon]

#todo need to resolve merge conflicts

[patcon]

Spun down translation server demo on request of team polis