Feature request: add spell checker?

**Is your feature request related to a problem? Please describe.**
mispelled words are a problem of many hackers where English is a second language.

**Describe the solution you'd like**
Add English and other language dictionaries in order to spell check copy/pasted code.

**Describe alternatives you've considered**
manual spell check outside of CyberChef?

**Additional context**
this came up as an idea related to entropy review of javacript code

The issue does not name any files, tests, or existing entry points. Start by locating CyberChef's text-input and operation UI, then determine how dictionaries, supported languages, and code-versus-prose handling should be defined; completion criteria are not specified and need clarification before implementation.

Written by the indexing model from the issue text.