use my ngettext() in other places too

src/common/i18n.py

@@ -60,8 +60,8 @@ def ngettext(s_sing, s_plural, n, replace_sing = None, replace_plural = None):
 	in other words this is a hack to ngettext() to support %s %d etc..
 	'''
 	text = _translation.ngettext(s_sing, s_plural, n)
-	if n == 1:
+	if n == 1 and replace_sing is not None:
 		text = text % replace_sing
-	else:
+	elif n > 1 and replace_plural is not None:
 		text = text % replace_plural
 	return text

src/systraywin32.py

@@ -263,11 +263,11 @@ class SystrayWin32(systray.Systray):
 					if jid != 'tabbed':
 						nb += jids[jid].nb_unread[jid]
 		
-		#FIXME: prepare me for transltaion (ngeetext() and all) for 0.9
-		if nb > 1:
-			text = 'Gajim - %s unread messages' % nb
-		else:
-			text = 'Gajim - 1 unread message'
+		text = i18n.ngettext(
+					'Gajim - one unread message',
+					'Gajim - %d unread messages',
+					nb, None, nb)
+
 		self.systray_winapi.notify_icon.set_tooltip(text)
 
 	def remove_jid(self, jid, account):

src/tooltips.py

@@ -207,10 +207,12 @@ class NotificationAreaTooltip(BaseTooltip, StatusTable):
 				accounts.append({'name': account, 'status_line': single_line, 
 						'show': status, 'message': message})
 		unread_messages_no = self.plugin.roster.nb_unread
-		if unread_messages_no > 1:
-			text = _('Gajim - %s unread messages') % unread_messages_no
-		elif unread_messages_no == 1:
-			text = _('Gajim - 1 unread message')
+
+		if unread_messages_no > 0:
+			text = i18n.ngettext(
+					'Gajim - one unread message',
+					'Gajim - %d unread messages',
+					unread_messages_no, None, unread_messages_no)
 		elif len(accounts) > 1:
 			text = _('Gajim')
 			self.current_row = 1