[polari] mainWindow: Use ngettext for plural string

[Florian Müllner <fmuellner src gnome org>]

commit fc3f3299cdec7c8edce8b3e7cdbdb956e0d19ee3
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Feb 26 12:40:08 2015 +0100

    mainWindow: Use ngettext for plural string
    
    Commit afa37a11c2f0ed added a more descriptive accessible name for the
    user-list button, but marked it incorrectly for translation - use the
    correct gettext function to allow correct translations according to the
    locale's plural rules.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=745203

 src/mainWindow.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/mainWindow.js b/src/mainWindow.js
index 7f31b7e..bb11d52 100644
--- a/src/mainWindow.js
+++ b/src/mainWindow.js
@@ -301,7 +301,8 @@ const MainWindow = new Lang.Class({
             this._room.channel.has_interface(Tp.IFACE_CHANNEL_INTERFACE_GROUP))
             numMembers = this._room.channel.group_dup_members_contacts().length;
 
-        let accessibleName = _("%d users".format(numMembers));
+        let accessibleName = ngettext("%d user",
+                                      "%d users", numMembers).format(numMembers);
         this._showUserListButton.get_accessible().set_name(accessibleName);
         this._showUserListButton.label = '%d'.format(numMembers);
     },