FIX: Change wording from title -> name in channel about page (#19889)

We refer to the channel name rather than title elsewhere
(including the new channel modal), so we should be consistent.
Title is an internal abstraction, since DM channels cannot have
names (currently).

Also change the name field on channel edit to a input type="text"
rather than a textarea, since we don't want a huge input here.

plugins/chat/config/locales/client.en.yml

@@ -233,6 +233,7 @@ en:
         associated_topic: Linked topic
         associated_category: Linked category
         title: Title
+        name: Name
         description: Description
 
       channel_info:
@@ -243,10 +244,10 @@ en:
           members: Members
           settings: Settings
 
-      channel_edit_title_modal:
-        title: Edit title
-        input_placeholder: Add a title
-        description: Give a short descriptive title to your channel
+      channel_edit_name_modal:
+        title: Edit name
+        input_placeholder: Add a name
+        description: Give a short descriptive name to your channel
 
       channel_edit_description_modal:
         title: Edit description