Bug 896156 - Fix problems in plurals and comments for Metro download bar strings [r=emtwo]

browser/metro/base/content/downloads.js

@@ -212,8 +212,7 @@ var Downloads = {
 
   _showDownloadCompleteNotification: function (aDownload) {
     let message = "";
-    let showInFilesButtonText = PluralForm.get(this._downloadCount,
-      Strings.browser.GetStringFromName("downloadsShowInFiles"));
+    let showInFilesButtonText = Strings.browser.GetStringFromName("downloadShowInFiles");
 
     let buttons = [
       {

browser/metro/locales/en-US/chrome/browser.properties

@@ -61,9 +61,8 @@ downloadRun=Run
 downloadSave=Save
 downloadCancel=Cancel
 downloadTryAgain=Try Again
-# LOCALIZATION NOTE (downloadsShowInFiles): Semicolon-separated list of plural forms.
-# 'Files' refers to the Windows 8 file explorer
-downloadsShowInFiles=Show download in Files;Show downloads in Files
+# LOCALIZATION NOTE (downloadShowInFiles): 'Files' refers to the Windows 8 file explorer
+downloadShowInFiles=Show in Files
 
 # Alerts
 alertLinkBookmarked=Bookmark added
@@ -79,16 +78,19 @@ alertDownloadsSize=Download too big
 alertDownloadsNoSpace=Not enough storage space
 # LOCALIZATION NOTE (alertDownloadSave): #1 is the file name, #2 is the file size, #3 is the file host
 alertDownloadSave=Do you want to run or save #1 (#2) from #3?
-# LOCALIZATION NOTE (alertDownloadMultiple): Semicolon-separated list of plural forms.
+# LOCALIZATION NOTE (alertDownloadMultiple): Semi-colon list of plural forms.
+# See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
 # #1 is the number of files, #2 is (amount downloaded so far / total amount to download) and #3 is seconds remaining
 alertDownloadMultiple=Downloading one file, #2, #3;Downloading #1 files, #2, #3
-# LOCALIZATION NOTE (alertMultipleDownloadsComplete): Semicolon-separated list of plural forms.
+# LOCALIZATION NOTE (alertMultipleDownloadsComplete): Semi-colon list of plural forms.
+# See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
 # #1 is the number of downloads completed
 alertMultipleDownloadsComplete=One download has been completed;#1 downloads have been completed
 alertDownloadFailed=Sorry, downloading %S failed.
 
 # Popup Blocker
-# LOCALIZATION NOTE (popupWarning.message): Semicolon-separated list of plural forms.
+# LOCALIZATION NOTE (popupWarning.message): Semi-colon list of plural forms.
+# See: http://developer.mozilla.org/en/docs/Localization_and_Plurals
 # #1 is brandShortName and #2 is the number of pop-ups blocked.
 popupWarning.message=#1 prevented this site from opening a pop-up window.;#1 prevented this site from opening #2 pop-up windows.
 popupButtonAllowOnce2=Allow once