* FEATURE: Add keywords support for site_settings search
This change allows for a new `keywords` field that can be added to site
settings in order to help with searching. Keywords are not visible in
the UI, but site settings matching one of the contained keywords will
appear when searching for that keyword.
Keywords can be added for site settings inside of the
`config/locales/server.en.yml` file under the new `keywords` key.
```
site_settings
example_1: "fancy description"
example_2: "another description"
keywords:
example_1: "capybara"
```
* Add keywords entry for a recently changed site setting and add system specs
* Use page.visit now that we have our own visit
This feature will allow sites to define which emoji are not allowed. Emoji in this list should be excluded from the set we show in the core emoji picker used in the composer for posts when emoji are enabled. And they should not be allowed to be chosen to be added to messages or as reactions in chat.
This feature prevents denied emoji from appearing in the following scenarios:
- topic title and page title
- private messages (topic title and body)
- inserting emojis into a chat
- reacting to chat messages
- using the emoji picker (composer, user status etc)
- using search within emoji picker
It also takes into account the various ways that emojis can be accessed, such as:
- emoji autocomplete suggestions
- emoji favourites (auto populates when adding to emoji deny list for example)
- emoji inline translations
- emoji skintones (ie. for certain hand gestures)
