Security improvements. Removed unused libs in 3rd party grammar engine, LanguageTool, that have known vulnerabilities (Jetty, Netty).
User dictionary validation:
Added restrictions to the max length for a word that can be added (up to 63 symbols).
Added restrictions to the max length of the dictionary name (up to 50 symbols), allowed symbols and letters (excluded non-Latin letters, symbols like spaces etc.).
Bug fixes
[WP-4063] WProofreader core: Issue with destroyed CKEditor 5
[WP-4071] WProofreader core: Settings dialog closes after click on it in Froala Editor
