Change wording from “Hide media” to “Hide image/images” in Web UI (#13834)

app/javascript/mastodon/components/media_gallery.js

app/javascript/mastodon/locales/bg.json

app/javascript/mastodon/locales/br.json

app/javascript/mastodon/locales/defaultMessages.json

app/javascript/mastodon/locales/en.json

app/javascript/mastodon/locales/ga.json

app/javascript/mastodon/locales/hi.json

app/javascript/mastodon/locales/kn.json

app/javascript/mastodon/locales/lt.json

app/javascript/mastodon/locales/lv.json

app/javascript/mastodon/locales/mk.json

app/javascript/mastodon/locales/ml.json

app/javascript/mastodon/locales/mr.json

app/javascript/mastodon/locales/ms.json

app/javascript/mastodon/locales/ur.json