* Change design of federation pages in admin UI
* Fix query performance in instance media attachments measure
* Fix reblogs being included in instance languages dimension
* Fix header button changing header size in settings pages
* Make form buttons look more like a part of the form in settings pages
- Put buttons closer, using same distance as between inputs
- Make buton font size a bit smaller to blend a bit more
- Add the class button to button tags for consisent styling
* Move .back-button inline styles to CSS file
All occurrences of the back-button CSS class used the same inline
CSS rules, so moved them over to the CSS file
* Fix “Add new domain block” button using inline CSS
* Replace common pattern of inline-styled button boxes by a CSS class
In particular, switching from `float: left/right` to a flexbox with
`justify-content: space-between`. This implied changing the order of
a few HTML tags and adding an empty `div` in one case.
Also removed a `margin-bottom` rule that wasn't needed due to the
margins of surrounding elements.
* Move account admin view inline CSS to CSS file
* Fix unused role routes being generated
* Remove unused JavaScript code
* Refactor filters code to be DRYer
* Fix `.count == 0` comparisons to `.empty?` in views
* Fix filters in views
Claire