no issue
This PR adds the server side logic for multiple authors. This adds the ability to add multiple authors per post. We keep and support single authors (maybe till the next major - this is still in discussion)
### key notes
- `authors` are not fetched by default, only if we need them
- the migration script iterates over all posts and figures out if an author_id is valid and exists (in master we can add invalid author_id's) and then adds the relation (falls back to owner if invalid)
- ~~i had to push a fork of bookshelf to npm because we currently can't bump bookshelf + the two bugs i discovered are anyway not yet merged (https://github.com/kirrg001/bookshelf/commits/master)~~ replaced by new bookshelf release
- the implementation of single & multiple authors lives in a single place (introduction of a new concept: model relation)
- if you destroy an author, we keep the behaviour for now -> remove all posts where the primary author id matches. furthermore, remove all relations in posts_authors (e.g. secondary author)
- we make re-use of the `excludeAttrs` concept which was invented in the contributors PR (to protect editing authors as author/contributor role) -> i've added a clear todo that we need a logic to make a diff of the target relation -> both for tags and authors
- `authors` helper available (same as `tags` helper)
- `primary_author` computed field available
- `primary_author` functionality available (same as `primary_tag` e.g. permalinks, prev/next helper etc)
refs #5345, refs #3801
- Blog localisation
- default is `en` (English)
- you can change the language code in the admin panel, see https://github.com/TryGhost/Ghost-Admin/pull/703
- blog behaviour changes depending on the language e.g. date helper format
- theme translation get's loaded if available depending on the language setting
- falls back to english if not available
- Theme translation
- complete automatic translation of Ghost's frontend for site visitors (themes, etc.), to quickly deploy a site in a non-English language
- added {{t}} and {{lang}} helper
- no backend or admin panel translations (!)
- easily readable translation keys - very simple translation
- server restart required when adding new language files or changing existing files in the theme
- no language code validation for now (will be added soon)
- a full theme translation requires to translate Ghost core templates (e.g. subscriber form)
- when activating a different theme, theme translations are auto re-loaded
- when switching language of blog, theme translations are auto re-loaded
- Bump gscan to version 1.3.0 to support more known helpers
**Documentation can be found at https://themes.ghost.org/v1.20.0/docs/i18n.**
closes#9200
- Registered new server helper `{{reading_time}}`.
- Added new global util `word-count` based on the util in Ghost admin, which returns the number of words in an HTML string.
- Based on the word count of the post html, the helper calculated the estimated reading time:
- 275 words per minute
- additional 12 seconds when post has feature image
- Renders a string like 'x min red', unless reading time is less than a minute. In this case, the rendered string is '< 1 min read'.
