Add buttons to block and unblock domain (#3127)

* Add buttons to block and unblock domain

* Relationship API now returns "domain_blocking" status for accounts,
rename "block entire domain" to "hide entire domain", fix unblocking domain,
do not block notifications from domain-blocked-but-followed people, do
not send Salmons to domain blocked users

* Add test

* Personal domain blocks shouldn't affect Salmon after all, since in this
direction of communication the control is very thin when it comes to
public stuff. Best stay consistent and not affect federation in this way

* Ignore followers and follow request from domain blocked folks,
ensure account domain blocks are not created for empty domain,
and avoid duplicates in validation

* Purge followers when blocking domain (without soft-blocks, since they
are useless here)

* Add tests, fix local timeline being empty when having any domain blocks

app/javascript/mastodon/locales/zh-HK.json

@@ -1,17 +1,20 @@
 {
   "account.block": "封鎖 @{name}",
+  "account.block_domain": "Hide everything from {domain}",
   "account.disclaimer": "由於這個用戶在另一個服務站，實際數字會比這個更多。",
   "account.edit_profile": "修改個人資料",
   "account.follow": "關注",
   "account.followers": "關注的人",
   "account.follows": "正在關注",
   "account.follows_you": "關注你",
+  "account.media": "Media",
   "account.mention": "提及 @{name}",
   "account.mute": "將 @{name} 靜音",
   "account.posts": "文章",
   "account.report": "舉報 @{name}",
   "account.requested": "等候審批",
   "account.unblock": "解除對 @{name} 的封鎖",
+  "account.unblock_domain": "Unhide {domain}",
   "account.unfollow": "取消關注",
   "account.unmute": "取消 @{name} 的靜音",
   "boost_modal.combo": "如你想在下次路過這顯示，請按{combo}，",
@@ -40,6 +43,8 @@
   "confirmations.block.message": "你確定要封鎖{name}嗎？",
   "confirmations.delete.confirm": "刪除",
   "confirmations.delete.message": "你確定要刪除{name}嗎？",
+  "confirmations.domain_block.confirm": "Hide entire domain",
+  "confirmations.domain_block.message": "Are you really, really sure you want to block the entire {domain}? In most cases a few targeted blocks or mutes are sufficient and preferable.",
   "confirmations.mute.confirm": "靜音",
   "confirmations.mute.message": "你確定要將{name}靜音嗎？",
   "emoji_button.activity": "活動",