refactor: update page title and template structure

Change the page title to use the language name from the model. 
Adjust the TrackPage::Header component to ensure proper 
formatting and maintainability of the template structure.

Author: rohitpaulk

app/templates/track.hbs

@@ -1,7 +1,7 @@
-{{page-title (concat "Join " this.model.affiliateLink.usernameForDisplay " on CodeCrafters") replace=true}}
+{{page-title @model.language.name}}
 
 <div class="container mx-auto lg:max-w-screen-lg px-3 md:px-6 py-6 md:py-10">
-  <TrackPage::Header @language={{@model.language}} @courses={{this.sortedCourses}} />
+  <TrackPage::Header @language={{@model.language}} @courses={{this.sortedCourses}}>
 </div>
 
 <div class="h-px bg-gray-200 dark:bg-white/5 w-full"></div>