Fixes #1645 and #1644 (#1646)

* Fixes #1645

* Fixes #1644 as well

* hopefully this should fix it

* Update download.jsx

* Update download.jsx

src/views/download/download.jsx

@@ -231,6 +231,7 @@ var Download = injectIntl(React.createClass({
                             <p><FormattedMessage id='download.knownIssuesOne' /></p>
                             <p><FormattedMessage id='download.knownIssuesTwo' /></p>
                             <p><FormattedHTMLMessage id='download.knownIssuesThree' /></p>
+                            <p><FormattedMessage id='download.knownIssuesFour' /></p>
                             <a href="https://scratch.mit.edu/discuss/3/" className='button mod-link'>
                                 <FormattedMessage id='download.reportBugs' />
                             </a>

src/views/download/l10n.json

 {
   "download.title": "Scratch 2.0 Offline Editor",
   "download.intro": "You can install the Scratch 2.0 editor to work on projects without an internet connection. This version will work on Mac, Windows, and some versions of Linux (32 bit).",
-  "download.introMac": "<b>Note for Mac Users:</b> the latest version of Scratch 2.0 Offline requires Adobe Air 20. To upgrade to Adobe Air 20 manually, go <a href=\"https://get.adobe.com/air/\">here</a>.",
+  "download.introMac": "<b>Note for Mac Users:</b> the latest version of Scratch 2.0 Offline requires Adobe AIR 20. To upgrade to Adobe AIR 20 manually, go <a href=\"https://get.adobe.com/air/\">here</a>.",
   "download.installation": "Installation",
   "download.airTitle": "Adobe AIR",
   "download.airBody": "If you don't already have it, download and install the latest <a href=\"http://get.adobe.com/air/\">Adobe AIR</a>",
@@ -24,9 +24,10 @@
   "download.otherVersionsOlder": "If you have an older computer, or cannot install the Scratch 2.0 offline editor, you can try installing <a href=\"http://scratch.mit.edu/scratch_1.4/\">Scratch 1.4</a>.",
   "download.otherVersionsAdmin": "If you are a network administrator: a Scratch 2.0 MSI has been created and maintained by a member of the community and hosted for public download <a href=\"http://llk.github.io/scratch-msi/\">here</a>.",
   "download.knownIssuesTitle": "Known issues",
-  "download.knownIssuesOne": "If your offline editor is crashing directly after Scratch is opened, install the Scratch 2 offline editor again (see step 2 above). This issue is due to a bug introduced in Adobe Air version 14 (released April 2014).",
+  "download.knownIssuesOne": "If your offline editor is crashing directly after Scratch is opened, install the Scratch 2 offline editor again (see step 2 above). This issue is due to a bug introduced in Adobe AIR version 14 (released April 2014).",
   "download.knownIssuesTwo": "Graphic effects blocks (in \"Looks\") may slow down projects due to a known Flash bug.",
   "download.knownIssuesThree": "The <b>backpack</b> is not yet available.",
+  "download.knownIssuesFour": "On Mac OS you may see a prompt indicating that \"Scratch 2 is trying to install a new helper tool\" and asking for your user name and password. We are currently investigating a solution to this problem.",
   "download.reportBugs": "Report Bugs and Glitches",
   "download.notAvailable": "Hmm, editor downloads are not available right now - please refresh the page to try again."
 }