- main improvements
  - de translations can now be edited from the admin interface
  - in frontend code we now have autocomplete for translation ids
- change in use
  - i18n-svelte -> lib/tr.ts
  - `$locale` -> `tr.locale`
  - `$locales` -> `tr.locales`
  - `$_('a.b')` -> `tr.d.a.b`
  - to add a text, add the id to lib/translations.ts
- code changes
  - remove i18n-svelte library
  - remove locales/de.json: this is now included in the static folder of the deployed website, not part of the frontend source code anymore
  - use camel case for all translation ids for consistency and to allow use without quotes
  - de is now also editable in admin interface
- resolves #211

TODO: relabel? tr -> i18n, .d -> .tr, i.e. `i18n.tr.a.b`

- main improvements
  - all language texts can now be edited from the admin interface
  - in frontend code we now have autocomplete for translation ids
- change in use
  - i18n-svelte -> lib/i18n.svelte
  - `$locale` -> `i18n.locale`
  - `$locales` -> `i18n.locales`
  - `$_('a.b')` -> `i18n.tr.a.b`
  - to add a text, add the id to lib/translations.ts
- code changes
  - remove i18n-svelte library
  - remove locales/de.json: this is now included in the static folder of the deployed website, not part of the frontend source code anymore
  - use camel case for all translation ids for consistency and to allow use without quotes
  - de is now also editable in admin interface
- resolves #211