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-CN.json

@@ -1,17 +1,20 @@
 {
   "account.block": "屏蔽 @{name}",
+  "account.block_domain": "Hide everything from {domain}",
   "account.disclaimer": "由于这个账户处于另一个服务站上，实际数字会比这个更多。",
   "account.edit_profile": "修改个人资料",
   "account.follow": "关注",
   "account.followers": "关注者",
   "account.follows": "正关注",
   "account.follows_you": "关注你",
+  "account.media": "Media",
   "account.mention": "提及 @{name}",
   "account.mute": "将 @{name} 静音",
   "account.posts": "嘟文",
   "account.report": "举报 @{name}",
   "account.requested": "等候审批",
   "account.unblock": "解除对 @{name} 的屏蔽",
+  "account.unblock_domain": "Unhide {domain}",
   "account.unfollow": "取消关注",
   "account.unmute": "取消 @{name} 的静音",
   "boost_modal.combo": "如你想在下次路过时显示，请按{combo}，",
@@ -40,6 +43,8 @@
   "confirmations.block.message": "想好了，真的要屏蔽 {name}?",
   "confirmations.delete.confirm": "删除",
   "confirmations.delete.message": "想好了，真的要删除这条嘟文?",
+  "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": "静音",
   "confirmations.mute.message": "想好了，真的要静音 {name}?",
   "emoji_button.activity": "活动",