Rename legacy PleromaFE Chat functionality to "Shout"

This complements pleroma!2842 (merged)

src/boot/after_store.js

@@ -240,7 +240,7 @@ const getNodeInfo = async ({ store }) => {
       store.dispatch('setInstanceOption', { name: 'registrationOpen', value: data.openRegistrations })
       store.dispatch('setInstanceOption', { name: 'mediaProxyAvailable', value: features.includes('media_proxy') })
       store.dispatch('setInstanceOption', { name: 'safeDM', value: features.includes('safe_dm_mentions') })
-      store.dispatch('setInstanceOption', { name: 'shoutAvailable', value: features.includes('shout') })
+      store.dispatch('setInstanceOption', { name: 'shoutAvailable', value: features.includes('chat') })
       store.dispatch('setInstanceOption', { name: 'pleromaChatMessagesAvailable', value: features.includes('pleroma_chat_messages') })
       store.dispatch('setInstanceOption', { name: 'gopherAvailable', value: features.includes('gopher') })
       store.dispatch('setInstanceOption', { name: 'pollsAvailable', value: features.includes('polls') })