Got the installer working. Fixed a few bugs including a nasty-to-debug issue where the lang_id was being hardcoded during installation, resulting in strings being inserted with the wrong lang_id causing an infinfinite loop with fetch() throwing a "no strings" error and using template (which calls fetch()) to complain

tinyMCE.addI18n('en.advhr_dlg',{
width:"Width",
size:"Height",
noshade:"No shadow"
});