Resolve "Skip loading English Frontend Translation File"

What does this MR do?

It skips loading the js translation file if the current language is English and it also removes the loaded translations from the global object to save memory.

Why was this MR needed?

Performance Optimisation

Does this MR meet the acceptance criteria?

• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #38845 (closed)