help: Update button labels that are not lower case in documentation.

help/include/left-sidebar-conversations.md

@@ -5,14 +5,14 @@ and the channels you are subscribed to.
 
 {tab|desktop-web}
 
-1. Click on **DIRECT MESSAGES** or the name of a channel in the left sidebar. You
+1. Click on **direct messages** or the name of a channel in the left sidebar. You
    will see a list of the most recent unread conversations that you have not [muted](/help/mute-a-topic).
 
 1. Click on the conversation you are interested in.
 
 !!! tip ""
 
-    To see all conversations, click on **MORE CONVERSATIONS** (in direct messages) or **SHOW ALL TOPICS**
+    To see all conversations, click on **more conversations** (in direct messages) or **show all topics**
     (in a channel).
 
 {end_tabs}

help/reading-strategies.md

@@ -58,7 +58,7 @@ You can see all your direct messages in one place.
 {tab|desktop-web}
 
 1. Click on the **Direct message feed** (<i class="zulip-icon
-   zulip-icon-all-messages"></i>) icon next to **DIRECT MESSAGES** in the left
+   zulip-icon-all-messages"></i>) icon next to **direct messages** in the left
    sidebar.
 
 1. Read your direct messages, starting from your first unread message. You can
@@ -85,7 +85,7 @@ on.
 {tab|desktop-web}
 
 1. Find the channel you want to read in the left sidebar. If you don't see it
-   right away, you can search for a channel by clicking on **CHANNELS** in the
+   right away, you can search for a channel by clicking on **channels** in the
    left sidebar, or using the <kbd>Q</kbd> [keyboard
    shortcut](/help/keyboard-shortcuts).
 

help/star-a-message.md

@@ -76,7 +76,7 @@ to their right.
 !!! tip ""
 
     If the **views** section in the left sidebar is collapsed, click the
-    triangle to the left of **VIEWS** to uncollapse it.
+    triangle to the left of **views** to uncollapse it.
 
 {end_tabs}