Fix English require case sensitivity

- Change 'require "english"' to 'require "English"' in bin/dev script
- Fixes LoadError in CI test environment

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

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

Author: justin808

lib/generators/react_on_rails/bin/dev

@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-require "english"
+require "English"
 
 def installed?(process)
   IO.popen "#{process} -v"