The referenced syntax highlighting file is full of errors including big syntax mistakes. I have attached the smarty wordfile with all mistakes and errors fixed.
Attention: If you add this wordfile to standard wordfile.uew, you have to replace existing language definition for HTML because only 1 language in the wordfile can have the required keyword HTML_LANG. If there are 2 language definitions with keyword HTML_LANG, the multi-language highlighting for all type of HTML files will not work anymore - see in help of UltraEdit the page about Syntax Highlighting.