[Bug] Parser and Syntax Highlighting have problems with JavaScript template strings

[rozek]

Just try

    init
      put `
        first line, e.g. with <div/>
        second line with .class
      ` after me
      def this is just a syntax error
    end

e.g., as part of a behaviour.

Within VisualStudio Code, syntax highlighting does not treat the template string as such but highlights its contents.

When parsed, line (and column?) numbers of parser errors will be computed wrong and point to a wrong position in the source code