Rename legacy PleromaFE Chat functionality to "Shout"

This complements pleroma!2842 (merged)

src/App.js

@@ -4,7 +4,7 @@ import Notifications from './components/notifications/notifications.vue'
 import InstanceSpecificPanel from './components/instance_specific_panel/instance_specific_panel.vue'
 import FeaturesPanel from './components/features_panel/features_panel.vue'
 import WhoToFollowPanel from './components/who_to_follow_panel/who_to_follow_panel.vue'
-import ChatPanel from './components/chat_panel/chat_panel.vue'
+import ShoutPanel from './components/shout_panel/shout_panel.vue'
 import SettingsModal from './components/settings_modal/settings_modal.vue'
 import MediaModal from './components/media_modal/media_modal.vue'
 import SideDrawer from './components/side_drawer/side_drawer.vue'
@@ -26,7 +26,7 @@ export default {
     InstanceSpecificPanel,
     FeaturesPanel,
     WhoToFollowPanel,
-    ChatPanel,
+    ShoutPanel,
     MediaModal,
     SideDrawer,
     MobilePostStatusButton,
@@ -65,7 +65,7 @@ export default {
         }
       }
     },
-    chat () { return this.$store.state.chat.channel.state === 'joined' },
+    shout () { return this.$store.state.shout.channel.state === 'joined' },
     suggestionsEnabled () { return this.$store.state.instance.suggestionsEnabled },
     showInstanceSpecificPanel () {
       return this.$store.state.instance.showInstanceSpecificPanel &&