Also lay some groundwork needed to interactively change the
glitchfriend.

The codebase uses "elefriend" because it's shorter and didn't require me
to realign the actions in actions/compose.js.  Same idea, though.

Glitched elephant friends kindly provided by @ncls7615.

flavours/glitch/util/initial_state is used in places where we want to
exhibit different behavior based on user preferences.  This means that
it's used in places where no preference is defined, i.e. on an
unauthenticated access.  All values exported from that module must
therefore expect that case; previously, the max chars value didn't.

Addresses #306.

* Fix actors accepting invalid URI schemes or different host between URI and URL

* Fix statuses accepting invalid URI scheme or different host to actor

* Adjust tests to new requirements

* Improve readability of mismatching_origin?/invalid_origin? methods

* i18n: (zh-CN) Add translations of #6125

* i18n: (zh-CN) Add translations of #6132

* i18n: (zh-CN) Add translations of #6099

* i18n: (zh-CN) Add translations of #6071

* i18n: (zh-CN) Improve translations

Update ja.js for #296

Threaded mode~

Fix search popout

max_toot_chars is present in the root of the initial state object.
(Previously, we were trying to read it from the meta child object.)

Web push updates

unique ColumnLink keys in getting_started

Compose refactor

Fixes #6197.

i18n: 🇵🇱