Add tooltip for unauthenticated download

Author: yugalkaushik

client/modules/IDE/components/Header/Nav.jsx

@@ -203,6 +203,9 @@ const ProjectMenu = () => {
           id="file-download"
           isDisabled={isUnsaved}
           onClick={downloadSketch}
+          title={
+            !user.authenticated ? t('Nav.File.LoginToDownload') : undefined
+          }
         >
           {t('Nav.File.Download')}
         </MenubarItem>

translations/locales/en-US/translations.json

@@ -8,7 +8,8 @@
       "Open": "Open",
       "Download": "Download",
       "AddToCollection": "Add to Collection",
-      "Examples": "Examples"
+      "Examples": "Examples",
+      "LoginToDownload": "You must be logged in to download your sketch"
     },
     "Edit": {
       "Title": "Edit",