add hints for translation linting and remove notes

customize.dist/four-oh-four.js

@@ -14,6 +14,7 @@ define([
 
     var is500 = Boolean(document.querySelector('#five-hundred'));
     var brand = h('h1#cp-brand', 'CryptPad');
+    // Msg.fivehundred_internalServerError.four04_pageNotFound
     var message = h('h2#cp-scramble', Messages[is500? 'fivehundred_internalServerError':'four04_pageNotFound']);
     var title = h('h2#cp-title', is500? "500":"404");
 

lib/storage/blob.js

@@ -496,7 +496,8 @@ BlobStore.create = function (config, _cb) {
             if (e) { CB(e); }
         }));
     }).nThen(function (w) {
-        // XXX make a placeholder file in the root of the blob path
+        // make a placeholder file in the root of the blob path
+        // so that the checkup page always has a resource it can check
         var fullPath = Path.join(Env.blobPath, 'placeholder.txt');
         Fse.writeFile(fullPath, 'PLACEHOLDER\n', w());
     }).nThen(function () {

www/admin/inner.js

@@ -1968,7 +1968,7 @@ define([
 
     create['bytes-written'] = function () {
         var key = 'bytes-written';
-        var $div = makeBlock(key);
+        var $div = makeBlock(key); // Msg.admin_bytesWrittenTitle.admin_bytesWrittenHint
 
         var duration = APP.instanceStatus.profilingWindow;
         if (!isPositiveInteger(duration)) { duration = 10000; }

www/support/inner.js

@@ -49,7 +49,7 @@ define([
             'cp-support-language',
             'cp-support-form',
         ],
-        'debugging': [
+        'debugging': [ // Msg.support_cat_debugging
             'cp-support-debugging-data',
         ],
     };