Fixes #16293

* Add interrelationship icon

* Fix arrow for rtl

* Fix to predefined color

Change `account_link_to` to use an image tag rather than some
inline CSS. Dropped the `size` parameter in the process, but it wasn't
used for anything except the default value of 36px.

Dropped CSS rules that were always overriden, and defaulted to 36px width
and height instead.

This reverts commit 7da54001fe.

One user suggested that the loading indicator should not be written
ALL CAPS, at first it was thought this change is very minor, but then
a few other people asked agreed on the same thing - variant without
caps looks better. It may be related that it is harder to read or just
looks too "catchy". Moreover, I asked @rf@mastodonsocial.ru community
what they think of that and 82% of 22 people agreed on this change.

This commit removes all usage of text-transform: uppercase, where the
font size specified, it changes the value by one pixel larger, so we
still keeping the "designed" size of the labels but without using CAPS.

Move public domain blocks information to about page

Regression from f371b32

* Add "why do you want to join" field to invite requests

Fix #10512

* Remove unused translations

* Fix broken registrations when no invite request text is submitted

* Add hashtag filter to profiles

GET /@:username/tagged/:hashtag
GET /api/v1/accounts/:id/statuses?tagged=:hashtag

* Display featured hashtags on public profile

* Use separate model for featured tags

* Update featured hashtag counters on-write

* Limit featured tags to 10

Fix #9845

Fix #9833

- Fix height not updating when clicking show more on public hashtag page
- Add header to the public hashtag page
- Change text size and margins on the public hashtag page

* Remove "most popular" tab from profile directory, add responsive design

* Remove unused translations

* Fix missing variable in directory page title

* Order hashtags by number of people instead of alphabetically

* Add icon to OpenGraph preview of directory page

* Prevent line breaks in hashtags and ensure lowercase in the table

Fix #5578

* Revert "Fix some icon names changed by the Font Awesome 5. (#8796)"

This reverts commit 3f9ec3de82.

* Revert "Migrate to font-awesome 5.0. (#8799)"

This reverts commit 8bae14591b.

* Revert "Fix some icons names, unavailable in fontawesome5 (free license). (#8792)"

This reverts commit b9c727a945.

* Revert "Update the icon name changed by the Font Awesome 5. (#8776)"

This reverts commit 17af4d27da.

* Revert "Add bot icon to bot avatars and migrate to newer version of Font Awesome (#8484)"

This reverts commit 4b794e134d.

Follow-up to #8142