Refactor currency_converter.py (#5917)

* Update currency_converter.py

* refactor: add types and remove reserved  keyword "from" usage

* feat: update text

* Update web_programming/currency_converter.py

Co-authored-by: xcodz-dot <[email protected]>

* Update web_programming/currency_converter.py

Co-authored-by: xcodz-dot <[email protected]>

* fix: update currency_converter.py

* updating DIRECTORY.md

* Update currency_converter.py

Co-authored-by: xcodz-dot <[email protected]>
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Christian Clauss <[email protected]>