Add language switching menu into global nav

app/helpers/application_helper.rb

@@ -1,3 +1,5 @@
+# coding: utf-8
+
 module ApplicationHelper
   def need_restart?
     Plugin.gemfile_changed?
@@ -35,6 +37,14 @@ module ApplicationHelper
     %Q|<li><a><div>#{icon icon_class} <span>#{text}</span></div></a></li>|.html_safe
   end
 
+  def language_name(locale)
+    # NOTE: these are fixed terms, not i18n-ed
+    {
+      en: "English",
+      ja: "日本語",
+    }[locale] || locale
+  end
+
   def link_to_other(text, path)
     if current_page?(path)
       # NOTE: sb-admin set style for element name instead of class name, such as ".nav a". So use "a" element even if it isn't a link.

app/views/layouts/application.html.erb

@@ -37,6 +37,18 @@
             <!-- /.navbar-header -->
 
             <ul class="nav navbar-top-links navbar-right">
+              <li class="dropdown">
+                <a class="dropdown-toggle " data-toggle="dropdown" href="#">
+                  <%= t("terms.switch_language") %>
+                  <%= icon("fa-caret-down") %>
+                </a>
+                <ul class="nav dropdown-menu dropdown-alerts">
+                  <% I18n.available_locales.each do |locale| %>
+                    <li><a href="?lang=<%= locale %>"><%= language_name locale %></a></li>
+                  <% end %>
+                </ul>
+                <!-- /.dropdown-alerts -->
+              </li>
               <li class="dropdown">
                 <a class="dropdown-toggle <%= "btn-info" if has_alert? %>" data-toggle="dropdown" href="#">
                   <i class="fa fa-bell fa-fw"></i>  <i class="fa fa-caret-down"></i>

config/locales/translation_en.yml

@@ -24,6 +24,7 @@ en:
     new: New
     setup: "Setup %{target}"
     install_it: "Install %{target}"
+    switch_language: Switch Language
 
   plugins:
     common: &plugin_common

config/locales/translation_ja.yml

@@ -24,6 +24,7 @@ ja:
     new: 新規作成
     setup: "%{target}をセットアップ"
     install_it: "%{target}をインストール"
+    switch_language: 言語切り替え
 
   plugins:
     common: &plugin_common