add tooltip for open devtools icon

app/langs/zh_Hans.txt

@@ -224,6 +224,7 @@ Updating Task Information Interval=任务信息更新间隔
 Keyboard Shortcuts=键盘快捷键
 Supported Keyboard Shortcuts=支持的键盘快捷键
 Set Focus On Search Box=将焦点放在搜索框上
+Open Browser DevTools=打开浏览器开发者工具
 Swipe Gesture=滑动手势
 Change Tasks Order by Drag-and-drop=拖拽任务排序
 Action After Creating New Tasks=创建新任务后执行操作

app/langs/zh_Hant.txt

@@ -224,6 +224,7 @@ Updating Task Information Interval=工作資訊更新間隔
 Keyboard Shortcuts=鍵盤快速鍵
 Supported Keyboard Shortcuts=支援的鍵盤快速鍵
 Set Focus On Search Box=將焦點設在搜尋框上
+Open Browser DevTools=打開瀏覽器開發者工具
 Swipe Gesture=滑動手勢
 Change Tasks Order by Drag-and-drop=拖拽工作排序
 Action After Creating New Tasks=建立新工作後執行操作

app/scripts/config/defaultLanguage.js

@@ -228,6 +228,7 @@
             'Keyboard Shortcuts': 'Keyboard Shortcuts',
             'Supported Keyboard Shortcuts': 'Supported Keyboard Shortcuts',
             'Set Focus On Search Box': 'Set Focus On Search Box',
+            'Open Browser DevTools': 'Open Browser DevTools',
             'Swipe Gesture': 'Swipe Gesture',
             'Change Tasks Order by Drag-and-drop': 'Change Tasks Order by Drag-and-drop',
             'Action After Creating New Tasks': 'Action After Creating New Tasks',

app/views/debug.html

@@ -12,7 +12,7 @@
             </li>
             <li class="slim">
                 <a class="pointer-cursor" ng-click="showDevTools()">
-                    <i class="fa fa-wrench"></i>
+                    <i class="fa fa-wrench" title="{{'Open Browser DevTools' | translate}}"></i>
                 </a>
             </li>
         </ul>