chore: optimize/correct the VideoBlock code (#38012)

- Change the `i18n` service declaration from `wants` to `needs`, since the
  runtime must provide it for the block to function correctly.

- Update the `public_view` webpack JS reference from `VideoBlockMain` to
  `VideoBlockDisplay`, as all VideoBlock JS files are bundled into
  `VideoBlockDisplay` and `VideoBlockMain` is not referring to anything
   or no longer exists in the repository.

Author: farhan

xmodule/video_block/video_block.py

@@ -105,8 +105,8 @@
 EXPORT_IMPORT_STATIC_DIR = 'static'
 
 
-@XBlock.wants('settings', 'completion', 'i18n', 'request_cache', 'video_config')
-@XBlock.needs('mako', 'user')
+@XBlock.wants('settings', 'completion', 'request_cache', 'video_config')
+@XBlock.needs('mako', 'user', 'i18n')
 class _BuiltInVideoBlock(
         VideoFields, VideoTranscriptsMixin, VideoStudioViewHandlers, VideoStudentViewHandlers,
         EmptyDataRawMixin, XmlMixin, EditingMixin, XModuleToXBlockMixin,
@@ -265,7 +265,7 @@ def public_view(self, context):
 
         fragment = Fragment(self.get_html(view=PUBLIC_VIEW, context=context))
         add_css_to_fragment(fragment, 'VideoBlockDisplay.css')
-        add_webpack_js_to_fragment(fragment, 'VideoBlockMain')
+        add_webpack_js_to_fragment(fragment, 'VideoBlockDisplay')
         fragment.initialize_js('Video')
         return fragment