s/PubSubHubbub/WebSub/g (#4372)

README.md

config/locales/ca.yml

config/locales/de.yml

config/locales/en.yml

config/locales/fa.yml

config/locales/fr.yml

config/locales/he.yml

config/locales/id.yml

config/locales/io.yml

config/locales/ja.yml

config/locales/ko.yml

config/locales/nl.yml

config/locales/no.yml

config/locales/oc.yml

config/locales/pl.yml

config/locales/pt-BR.yml

config/locales/pt.yml

config/locales/ru.yml

config/locales/th.yml

config/locales/tr.yml