MM-40414: Add empty state icons (#25282)

Automatic Merge

webapp/channels/src/components/channel_header/components/__snapshots__/header_icon_wrapper.test.tsx.snap

@@ -48,7 +48,7 @@ exports[`components/channel_header/components/HeaderIconWrapper should match sna
         id="flaggedTooltip"
       >
         <Memo(MemoizedFormattedMessage)
-          defaultMessage="Saved posts"
+          defaultMessage="Saved messages"
           id="channel_header.flagged"
         />
       </Tooltip>
@@ -140,7 +140,7 @@ exports[`components/channel_header/components/HeaderIconWrapper should match sna
         id="pinnedPostTooltip"
       >
         <Memo(MemoizedFormattedMessage)
-          defaultMessage="Pinned posts"
+          defaultMessage="Pinned messages"
           id="channel_header.pinnedPosts"
         />
       </Tooltip>

webapp/channels/src/components/channel_header/components/header_icon_wrapper.tsx

@@ -55,13 +55,13 @@ const HeaderIconWrapper = (props: Props) => {
             class: 'text-nowrap',
             id: 'flaggedTooltip',
             messageID: t('channel_header.flagged'),
-            message: 'Saved posts',
+            message: 'Saved messages',
         },
         pinnedPosts: {
             class: 'pinned-posts',
             id: 'pinnedPostTooltip',
             messageID: t('channel_header.pinnedPosts'),
-            message: 'Pinned posts',
+            message: 'Pinned messages',
         },
         recentMentions: {
             class: '',