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
tinyMCEPopup.requireLangPack();
var EmotionsDialog = {
init : function(ed) {
tinyMCEPopup.resizeToInnerSize();
},
insert : function(file, title) {
var ed = tinyMCEPopup.editor, dom = ed.dom;
tinyMCEPopup.execCommand('mceInsertContent', false, dom.createHTML('img', {
src : tinyMCEPopup.getWindowArg('plugin_url') + '/img/' + file,
alt : ed.getLang(title),
title : ed.getLang(title),
border : 0
}));
tinyMCEPopup.close();
}
};
tinyMCEPopup.onInit.add(EmotionsDialog.init, EmotionsDialog);