Improve payload format of Web Push API now that it's open (#7521)

> Good lord what is happening in there

Previously the contents of the Web Push API payloads closely resembled the structure of JavaScript's [Notification](https://developer.mozilla.org/en-US/docs/Web/API/Notification). But now that the API is open to non-browser apps, and given that there is no required coupling between contents of the payload and a Notification object, here is how I changed the payload:

```json
{ 
  "access_token": "...",
  "preferred_locale": "en",
  "notification_id": "12345",
  "notification_type": "follow",
  "title": "So and so followed you",
  "body": "This is my bio",
  "icon": "https://example.com/avatar.png"
}
```

The title, body and icon attributes are included as a fallback so you can construct a minimal notification if you cannot perform a network request to the API to get more data.

config/locales/ar.yml

@@ -576,19 +576,6 @@ ar:
     other: إعدادات أخرى
     publishing: النشر
     web: الويب
-  push_notifications:
-    favourite:
-      title: أعجب %{name} بمنشورك
-    follow:
-      title: "%{name} من متتبعيك الآن"
-    group:
-      title: "%{count} إخطارات"
-    mention:
-      action_boost: ترقية
-      action_expand: عرض المزيد
-      title: أشار إليك %{name}
-    reblog:
-      title: قام %{name} بترقية منشورك
   remote_follow:
     acct: قم بإدخال عنوان حسابك username@domain الذي من خلاله تود المتابعة
     missing_resource: تعذر العثور على رابط التحويل المطلوب الخاص بحسابك

config/locales/ca.yml

@@ -594,20 +594,6 @@ ca:
     other: Altre
     publishing: Publicació
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} ha marcat com a preferit el teu estat"
-    follow:
-      title: "%{name} ara et segueix"
-    group:
-      title: "%{count} notificacions"
-    mention:
-      action_boost: Retooteja
-      action_expand: Mostra'n més
-      action_favourite: Preferit
-      title: "%{name} t'ha mencionat"
-    reblog:
-      title: "%{name} t'ha retootejat"
   remote_follow:
     acct: Escriu el teu usuari@domini des del qual vols seguir
     missing_resource: No s'ha pogut trobar la URL de redirecció necessaria per al compte

config/locales/co.yml

@@ -593,20 +593,6 @@ co:
     other: Altre
     publishing: Pubblicazione
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} hà aghjuntu u vostru statutu à i so favuriti"
-    follow:
-      title: "%{name} vi seguita"
-    group:
-      title: "%{count} nutificazioni"
-    mention:
-      action_boost: Sparte
-      action_expand: Vede di più
-      action_favourite: Aghjunghje à i favuriti
-      title: "%{name} v’hà mintuvatu·a"
-    reblog:
-      title: "%{name} hà spartutu u vostru statutu"
   remote_follow:
     acct: Entrate u vostru cugnome@istanza da induve vulete siguità stu contu
     missing_resource: Ùn avemu pussutu à truvà l’indirizzu di ridirezzione

config/locales/de.yml

@@ -594,20 +594,6 @@ de:
     other: Weiteres
     publishing: Beiträge
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} hat deinen Beitrag favorisiert"
-    follow:
-      title: "%{name} folgt dir nun"
-    group:
-      title: "%{count} Benachrichtigungen"
-    mention:
-      action_boost: Teilen
-      action_expand: Mehr anzeigen
-      action_favourite: Favorisieren
-      title: "%{name} hat dich erwähnt"
-    reblog:
-      title: "%{name} hat deinen Beitrag geteilt"
   remote_follow:
     acct: Profilname@Domain, von wo aus du dieser Person folgen möchtest
     missing_resource: Die erforderliche Weiterleitungs-URL für dein Konto konnte nicht gefunden werden

config/locales/en.yml

@@ -595,20 +595,6 @@ en:
     other: Other
     publishing: Publishing
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} favourited your status"
-    follow:
-      title: "%{name} is now following you"
-    group:
-      title: "%{count} notifications"
-    mention:
-      action_boost: Boost
-      action_expand: Show more
-      action_favourite: Favourite
-      title: "%{name} mentioned you"
-    reblog:
-      title: "%{name} boosted your status"
   remote_follow:
     acct: Enter your username@domain you want to follow from
     missing_resource: Could not find the required redirect URL for your account

config/locales/eo.yml

@@ -596,20 +596,6 @@ eo:
     other: Aliaj aferoj
     publishing: Publikado
     web: Reto
-  push_notifications:
-    favourite:
-      title: "%{name} stelumis vian mesaĝon"
-    follow:
-      title: "%{name} eksekvis vin"
-    group:
-      title: "%{count} sciigoj"
-    mention:
-      action_boost: Diskonigi
-      action_expand: Montri pli
-      action_favourite: Stelumi
-      title: "%{name} menciis vin"
-    reblog:
-      title: "%{name} diskonigis vian mesaĝon"
   remote_follow:
     acct: Enmetu vian uzantnomo@domajno de kie vi volas sekvi
     missing_resource: La URL de plusendado ne estis trovita

config/locales/es.yml

@@ -593,20 +593,6 @@ es:
     other: Otros
     publishing: Publicación
     web: Web
-  push_notifications:
-    favourite:
-      title: "%A {name} le gustó tu estado"
-    follow:
-      title: "%{name} te ha empezado a seguir"
-    group:
-      title: "%{count} notificaciones"
-    mention:
-      action_boost: Retoot
-      action_expand: Mostrar más
-      action_favourite: Me Gusta
-      title: "%{name} te mencionó"
-    reblog:
-      title: "%{name} boosteó tu estado"
   remote_follow:
     acct: Ingesa tu usuario@dominio desde el que quieres seguir
     missing_resource: No se pudo encontrar la URL de redirección requerida para tu cuenta

config/locales/fa.yml

@@ -593,20 +593,6 @@ fa:
     other: سایر
     publishing: انتشار
     web: وب
-  push_notifications:
-    favourite:
-      title: "%{name} نوشتهٔ شما را پسندید"
-    follow:
-      title: "%{name} هم‌اینک پیگیر شماست"
-    group:
-      title: "%{count} اعلان"
-    mention:
-      action_boost: بازبوق
-      action_expand: نمایش بیشتر
-      action_favourite: پسندیدن
-      title: "%{name} از شما نام برد"
-    reblog:
-      title: "%{name} نوشتهٔ شما را بازبوقید"
   remote_follow:
     acct: نشانی حساب username@domain خود را این‌جا بنویسید
     missing_resource: نشانی اینترنتی برای رسیدن به حساب شما پیدا نشد

config/locales/fi.yml

@@ -590,20 +590,6 @@ fi:
     other: Muut
     publishing: Julkaiseminen
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} tykkäsi tilastasi"
-    follow:
-      title: "%{name} seuraa nyt sinua"
-    group:
-      title: "%{count} ilmoitusta"
-    mention:
-      action_boost: Buustaa
-      action_expand: Näytä lisää
-      action_favourite: Tykkää
-      title: "%{nimi} mainitsi sinut"
-    reblog:
-      title: "%{name} buustasi tilaasi"
   remote_follow:
     acct: Syötä se käyttäjätunnus@verkkotunnus, josta haluat seurata
     missing_resource: Vaadittavaa uudelleenohjaus-URL:ää tiliisi ei löytynyt

config/locales/fr.yml

@@ -594,20 +594,6 @@ fr:
     other: Autre
     publishing: Publication
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} a mis votre statut en favori"
-    follow:
-      title: "%{name} vous suit"
-    group:
-      title: "%{count} notifications"
-    mention:
-      action_boost: Partager
-      action_expand: Montrer plus
-      action_favourite: Ajouter aux favoris
-      title: "%{name} vous a mentionné·e"
-    reblog:
-      title: "%{name} a partagé votre statut"
   remote_follow:
     acct: Entrez votre pseudo@instance depuis lequel vous voulez suivre cet·te utilisateur⋅ice
     missing_resource: L’URL de redirection n’a pas pu être trouvée

config/locales/gl.yml

@@ -594,20 +594,6 @@ gl:
     other: Outro
     publishing: Publicando
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} marcou favorito o seu estado"
-    follow:
-      title: "%{name} agora está a seguila"
-    group:
-      title: "%{count} notificacións"
-    mention:
-      action_boost: Promover
-      action_expand: Mostar máis
-      action_favourite: Favorito
-      title: "%{name} mencionouna"
-    reblog:
-      title: "%{name} promoveu un dos seus estados"
   remote_follow:
     acct: Introduza o seu nomedeusuaria@dominio desde onde quere facer seguimento
     missing_resource: Non se puido atopar o URL de redirecionamento requerido para a súa conta

config/locales/hu.yml

@@ -531,20 +531,6 @@ hu:
     other: Egyéb
     publishing: Közzététel
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} a kedvenceihez adta a tülköd"
-    follow:
-      title: "%{name} mostantól követ téged"
-    group:
-      title: "%{count} értesítés"
-    mention:
-      action_boost: Reblog
-      action_expand: Mutass többet
-      action_favourite: Kedvencekhez adás
-      title: "%{name} megemlített téged"
-    reblog:
-      title: "%{name} reblogolta a tülköd"
   remote_follow:
     acct: Írd be a felhasználódat, amelyről követni szeretnéd felhasznalonev@domain formátumban
     missing_resource: A fiókodnál nem található a szükséges átirányítási URL

config/locales/it.yml

@@ -506,18 +506,6 @@ it:
     other: Altro
     publishing: Pubblicazione
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} ha segnato il tuo status come apprezzato"
-    follow:
-      title: "%{name} ha iniziato a seguirti"
-    group:
-      title: "%{count} notifiche"
-    mention:
-      action_expand: Mostra altro
-      action_favourite: Apprezzato
-    reblog:
-      title: "%{name} ha condiviso il tuo status"
   remote_follow:
     acct: Inserisci il tuo username@dominio da cui vuoi seguire questo utente
     missing_resource: Impossibile trovare l'URL di reindirizzamento richiesto per il tuo account

config/locales/ja.yml

@@ -594,20 +594,6 @@ ja:
     other: その他
     publishing: 投稿
     web: ウェブ
-  push_notifications:
-    favourite:
-      title: あなたのトゥートが %{name} さんにお気に入り登録されました
-    follow:
-      title: "%{name} さんにフォローされました"
-    group:
-      title: "%{count} 件の通知"
-    mention:
-      action_boost: ブースト
-      action_expand: もっと見る
-      action_favourite: お気に入り
-      title: "%{name} さんから返信がありました"
-    reblog:
-      title: あなたのトゥートが %{name} さんにブーストされました
   remote_follow:
     acct: あなたの ユーザー名@ドメイン を入力してください
     missing_resource: リダイレクト先が見つかりませんでした

config/locales/ko.yml

@@ -596,20 +596,6 @@ ko:
     other: 기타
     publishing: 퍼블리싱
     web: 웹
-  push_notifications:
-    favourite:
-      title: "%{name} 님이 당신의 툿를 즐겨찾기에 등록했습니다"
-    follow:
-      title: "%{name} 님이 나를 팔로우 하고 있습니다"
-    group:
-      title: "%{count} 건의 알림"
-    mention:
-      action_boost: 부스트
-      action_expand: 더보기
-      action_favourite: 즐겨찾기
-      title: "%{name} 님이 답장을 보냈습니다"
-    reblog:
-      title: "%{name} 님이 당신의 툿을 부스트 했습니다"
   remote_follow:
     acct: 아이디@도메인을 입력해 주십시오
     missing_resource: 리디렉션 대상을 찾을 수 없습니다

config/locales/nl.yml

@@ -594,20 +594,6 @@ nl:
     other: Overig
     publishing: Publiceren
     web: Webapp
-  push_notifications:
-    favourite:
-      title: "%{name} markeerde jouw toot als favoriet"
-    follow:
-      title: "%{name} volgt jou nu"
-    group:
-      title: "%{count} meldingen"
-    mention:
-      action_boost: Boost
-      action_expand: Meer tonen
-      action_favourite: Favoriet
-      title: "%{name} vermeldde jou"
-    reblog:
-      title: "%{name} boostte jouw toot"
   remote_follow:
     acct: Geef jouw account@domein.tld op waarvandaan je wilt volgen
     missing_resource: Kon vereiste doorverwijzings-URL voor jouw account niet vinden

config/locales/no.yml

@@ -531,20 +531,6 @@
     other: Annet
     publishing: Publisering
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} favoriserte din status"
-    follow:
-      title: "%{name} følger deg nå"
-    group:
-      title: "%{count} varslinger"
-    mention:
-      action_boost: Fremhev
-      action_expand: Vis mer
-      action_favourite: Favoritter
-      title: "%{name} nevnte deg"
-    reblog:
-      title: "%{name} fremhevde din status"
   remote_follow:
     acct: Tast inn brukernavn@domene som du vil følge fra
     missing_resource: Kunne ikke finne URLen for din konto

config/locales/oc.yml

@@ -668,20 +668,6 @@ oc:
     other: Autre
     publishing: Publicar
     web: Interfàcia Web
-  push_notifications:
-    favourite:
-      title: "%{name} a mes vòstre estatut en favorit"
-    follow:
-      title: "%{name} vos sèc ara"
-    group:
-      title: "%{count} notificacions"
-    mention:
-      action_boost: Partejar
-      action_expand: Ne veire mai
-      action_favourite: Ajustar als favorits
-      title: "%{name} vos a mencionat"
-    reblog:
-      title: "%{name} a partejat vòstre estatut"
   remote_follow:
     acct: Picatz vòstre utilizaire@instància que cal utilizar per sègre aqueste utilizaire
     missing_resource: URL de redireccion pas trobada

config/locales/pl.yml

@@ -603,20 +603,6 @@ pl:
     other: Pozostałe
     publishing: Publikowanie
     web: Sieć
-  push_notifications:
-    favourite:
-      title: "%{name} dodał Twój wpis do ulubionych"
-    follow:
-      title: "%{name} zaczął Cię śledzić"
-    group:
-      title: "%{count} powiadomień"
-    mention:
-      action_boost: Podbij
-      action_expand: Pokaż więcej
-      action_favourite: Dodaj do ulubionych
-      title: "%{name} wspomniał o Tobie"
-    reblog:
-      title: "%{name} podbił Twój wpis"
   remote_follow:
     acct: Podaj swój adres (nazwa@domena), z którego chcesz śledzić
     missing_resource: Nie udało się znaleźć adresu przekierowania z Twojej domeny

config/locales/pt-BR.yml

@@ -593,20 +593,6 @@ pt-BR:
     other: Outro
     publishing: Publicação
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} favoritou a sua postagem"
-    follow:
-      title: "%{name} está te seguindo"
-    group:
-      title: "%{count} notificações"
-    mention:
-      action_boost: Compartilhar
-      action_expand: Mostrar mais
-      action_favourite: Favoritar
-      title: "%{name} mencionou você"
-    reblog:
-      title: "%{name} compartilhou a sua postagem"
   remote_follow:
     acct: Insira o seu usuário@domínio do qual você quer seguir
     missing_resource: Não foi possível encontrar a URL de direcionamento para a sua conta

config/locales/pt.yml

@@ -534,20 +534,6 @@ pt:
     other: Outro
     publishing: Publicação
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} adicionou o teu post aos favoritos"
-    follow:
-      title: "%{name} começou a seguir-te"
-    group:
-      title: "%{count} notificações"
-    mention:
-      action_boost: Partilhar
-      action_expand: Mostrar mais
-      action_favourite: Adicionar aos favoritos
-      title: "%{name} mencionou-te"
-    reblog:
-      title: "%{name} partilhou o teu post"
   remote_follow:
     acct: Entre seu usuário@domínio do qual quer seguir
     missing_resource: Não foi possível achar a URL de redirecionamento para sua conta

config/locales/ru.yml

@@ -606,20 +606,6 @@ ru:
     other: Другое
     publishing: Публикация
     web: WWW
-  push_notifications:
-    favourite:
-      title: Ваш статус понравился %{name}
-    follow:
-      title: "%{name} теперь подписан(а) на Вас"
-    group:
-      title: "%{count} уведомлений"
-    mention:
-      action_boost: Продвинуть
-      action_expand: Развернуть
-      action_favourite: Нравится
-      title: Вас упомянул(а) %{name}
-    reblog:
-      title: "%{name} продвинул(а) Ваш статус"
   remote_follow:
     acct: Введите username@domain, откуда Вы хотите подписаться
     missing_resource: Поиск требуемого перенаправления URL для Вашего аккаунта завершился неудачей

config/locales/sk.yml

@@ -591,20 +591,6 @@ sk:
     other: Ostatné
     publishing: Publikovanie
     web: Web
-  push_notifications:
-    favourite:
-      title: "%{name} si obľúbil/a tvoj príspevok"
-    follow:
-      title: "%{name} ťa teraz následuje"
-    group:
-      title: "%{count} notifikácie"
-    mention:
-      action_boost: Pozdvihni
-      action_expand: Ukáž viac
-      action_favourite: Obľúbené
-      title: "%{name} ťa spomenul/a"
-    reblog:
-      title: "%{name} vyzdvihli tvoj príspevok"
   remote_follow:
     acct: Napíš svoju prezývku@doménu z ktorej chceš následovať
     missing_resource: Nemôžeme nájsť potrebnú presmerovaciu adresu k tvojmu účtu

config/locales/sr-Latn.yml

@@ -525,20 +525,6 @@ sr-Latn:
     other: Ostali
     publishing: Objavljivanje
     web: Veb
-  push_notifications:
-    favourite:
-      title: "%{name} je stavio Vaš status za omiljeni"
-    follow:
-      title: "%{name} Vas je zapratio"
-    group:
-      title: "%{count} obaveštenja"
-    mention:
-      action_boost: Podrži
-      action_expand: Prikaži još
-      action_favourite: Omiljeni
-      title: "%{name} Vas je pomenuo"
-    reblog:
-      title: "%{name} je podržao(la) Vaš status"
   remote_follow:
     acct: Unesite Vaš korisnik@domen sa koga želite da pratite
     missing_resource: Ne mogu da nađem zahtevanu adresu preusmeravanja za Vaš nalog

config/locales/sr.yml

@@ -525,20 +525,6 @@ sr:
     other: Остали
     publishing: Објављивање
     web: Веб
-  push_notifications:
-    favourite:
-      title: "%{name} је ставио Ваш статус за омиљени"
-    follow:
-      title: "%{name} Вас је запратио"
-    group:
-      title: "%{count} обавештења"
-    mention:
-      action_boost: Подржи
-      action_expand: Прикажи још
-      action_favourite: Омиљени
-      title: "%{name} Вас је поменуо"
-    reblog:
-      title: "%{name} је подржао(ла) Ваш статус"
   remote_follow:
     acct: Унесите Ваш корисник@домен са кога желите да пратите
     missing_resource: Не могу да нађем захтевану адресу преусмеравања за Ваш налог

config/locales/sv.yml

@@ -592,20 +592,6 @@ sv:
     other: Annat
     publishing: Publicering
     web: Webb
-  push_notifications:
-    favourite:
-      title: "%{name} favoriserade din status"
-    follow:
-      title: "%{name} följer nu dig"
-    group:
-      title: "%{count} meddelanden"
-    mention:
-      action_boost: Knuffa
-      action_expand: Visa mer
-      action_favourite: Favoriter
-      title: "%{name} nämnde dig"
-    reblog:
-      title: "%{name} boostade din status"
   remote_follow:
     acct: Ange ditt användarnamn@domän du vill följa från
     missing_resource: Det gick inte att hitta den begärda omdirigeringsadressen för ditt konto

config/locales/zh-CN.yml

@@ -523,20 +523,6 @@ zh-CN:
     other: 其他
     publishing: 发布
     web: 站内
-  push_notifications:
-    favourite:
-      title: "%{name} 收藏了你的嘟文"
-    follow:
-      title: "%{name} 关注了你"
-    group:
-      title: "%{count} 条新通知"
-    mention:
-      action_boost: 转嘟
-      action_expand: 显示更多
-      action_favourite: 收藏
-      title: "%{name} 提到了你"
-    reblog:
-      title: "%{name} 转嘟了你的嘟文"
   remote_follow:
     acct: 请输入你的“用户名@实例域名”
     missing_resource: 无法确定你的帐户的跳转 URL

config/locales/zh-HK.yml

@@ -593,20 +593,6 @@ zh-HK:
     other: 其他
     publishing: 發佈
     web: 站内
-  push_notifications:
-    favourite:
-      title: "%{name} 收藏了你的文章"
-    follow:
-      title: "%{name} 關注了你"
-    group:
-      title: "%{count} 條新通知"
-    mention:
-      action_boost: 轉推
-      action_expand: 顯示更多
-      action_favourite: 收藏
-      title: "%{name} 提到了你"
-    reblog:
-      title: "%{name} 轉推了你的文章"
   remote_follow:
     acct: 請輸入你的︰用戶名稱@服務點域名
     missing_resource: 無法找到你用戶的轉接網址