[polari] roomStack: Mark app name "Polari" as translatable

[Florian Müllner <fmuellner src gnome org>]

commit 6f5e06d09fad56a8ef54c61fd66abd1e98dcff59
Author: Jiro Matsuzawa <jmatsuzawa gnome org>
Date:   Sat Sep 12 16:53:47 2015 +0900

    roomStack: Mark app name "Polari" as translatable
    
    https://bugzilla.gnome.org/show_bug.cgi?id=754916

 src/roomStack.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/roomStack.js b/src/roomStack.js
index f60d924..2156a60 100644
--- a/src/roomStack.js
+++ b/src/roomStack.js
@@ -93,7 +93,7 @@ const ChatPlaceholder = new Lang.Class({
 
         let title = new Gtk.Label({ use_markup: true, halign: Gtk.Align.START,
                                       margin_start: 14 });
-        title.label = '<span letter_spacing="4500">Polari</span>';
+        title.label = '<span letter_spacing="4500">%s</span>'.format(_("Polari"));
         title.get_style_context().add_class('polari-background-title');
 
         this._description = new Gtk.Label({ halign: Gtk.Align.CENTER, wrap: true,