Niiiiice! The labels for the composer buttons also contain the keyboard shortcuts! This is marvelous!
Just one nit: The Close button in the Sharing panel is the only one I found that is still missing the label. But all the other sharing options now speak properly, too! Great stuff! 
With these enhancements in the past few days, the major functionality of Discourse became much more accessible! I will probably run into other little things as I continue to use various instances of Discourse, and will report them ASAP. But if all these are so easy to fix, we should be in good shape! 
Marco