There was a lot of locale handling to get correct/expected date
formatting within the app.
Carbon now has built-in locale content rather than us needing to target
specific system locales.
This also removes setting locale via Carbon directly.
Carbon registers its own Laravel service provider which seems to
accurately pull the correct locale from the app.
For #4555
- Reduced app settings down to what's required.
- Used new view-shared $locale object instead of using globals via
config.
- Aligned language used to default on "locale" instead of mixing
locale/language.
For #4501
Extracted much of the language and locale work to a seperate, focused class.
Updated php set_locale usage to prioritise UTF8 usage.
Added locale options for windows.
Clarified what's a locale and a bookstack language string.
For #3590 and maybe #3650
So that DB/User access is not explicitly enforced.
Same for GlobalViewData middleware although that was also just doubling
up on ways to access user/auth info.
Also cleaned up Localization Middleware doc blocks.
For #939
- Adds way to check if current language is RTL via config system.
- Made TinyMCE default direction be based on current language text
direction.
- Fixed bullet points to be RTL compatible.
- Set page content body to have direction based on content.
