Remove language setting from profile page

Since language switching is now available in the header for all users,
the separate language setting section in the profile page is redundant.

Changes:
- Remove update-locale-form include from profile/edit.blade.php
- Delete profile/partials/update-locale-form.blade.php

Users can now change language using the header dropdown instead.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/resources/views/profile/edit.blade.php

@@ -13,12 +13,6 @@
                 </div>
             </div>
 
-            <div class="p-4 sm:p-8 bg-white shadow sm:rounded-lg">
-                <div class="max-w-xl">
-                    @include('profile.partials.update-locale-form')
-                </div>
-            </div>
-
             <div class="p-4 sm:p-8 bg-white shadow sm:rounded-lg">
                 <div class="max-w-xl">
                     @include('profile.partials.update-password-form')