add finnish language

Create Finnish translation for Mastodon

I was informed that the current warning if you @ a remote server in a private post is inadequate. These are suggested changes to better inform users.

Remove note about following Gargron@mastodon.social from getting started text

"whole known network" which is what public timeline used to be

Only domain blocks with suspend severity will block PuSH subscriptions
Silenced accounts should not appear in conversations unless followed

Add variable for text of privacy disclaimer

The "settings" links in the Getting Started section (or, if #399 were to happen, "more" menu) and compose sections are now different; the "compose" link is "Edit profile," while the one in the Getting Started section is now "Preferences."

All languages have been updated to accommodate this, based on the existing usages of these phrases in language files in the Rails part of the app!

addresses part of #384

in the column and what appears as desktop notifications. Settings do not
persist yet

Fix #233, fix #268

Fix #289 - don't download avatar unless the URL is http/https
Fix #293 - reblog/reblogged is now boost/boosted

Forgot to add `fr` here.

skip ActionCable for follow/unfollow/block events, instead clear UI from
blocked account's posts instantly if block request succeeds. Add forgotten
i18n for sensitive content

🎺 https://mastodon.social/users/Pierrec/updates/100589

before loading new one, cache notifications API, fix missing follow button
on public profiles