UX: update icon and text for copying message (#815)

assets/javascripts/initializers/ai-bot-replies.js

@@ -177,7 +177,7 @@ function initializeShareButton(api) {
 
     return {
       action: shareAiResponse,
-      icon: "share-alt",
+      icon: "far-copy",
       className: "post-action-menu__share",
       title: "discourse_ai.ai_bot.share",
       position: "first",

config/locales/client.en.yml

@@ -375,7 +375,7 @@ en:
         cancel_streaming: "Stop reply"
         default_pm_prefix: "[Untitled AI bot PM]"
         shortcut_title: "Start a PM with an AI bot"
-        share: "Share AI conversation"
+        share: "Copy AI conversation"
         conversation_shared: "Conversation copied"
         debug_ai: "View raw AI request and response"
         debug_ai_modal: