add Chinese translation to all levels in 'Ramping up','Advanced Topics' and modify the other levels's translation except those in 'A Mixed Bag'.

src/levels/rampup/detachedHead.js

@@ -3,10 +3,12 @@ exports.level = {
   "solutionCommand": "git checkout C4",
   "startTree": "{\"branches\":{\"master\":{\"target\":\"C2\",\"id\":\"master\"},\"bugFix\":{\"target\":\"C4\",\"id\":\"bugFix\"}},\"commits\":{\"C0\":{\"parents\":[],\"id\":\"C0\",\"rootCommit\":true},\"C1\":{\"parents\":[\"C0\"],\"id\":\"C1\"},\"C2\":{\"parents\":[\"C1\"],\"id\":\"C2\"},\"C3\":{\"parents\":[\"C1\"],\"id\":\"C3\"},\"C4\":{\"parents\":[\"C3\"],\"id\":\"C4\"}},\"HEAD\":{\"target\":\"master\",\"id\":\"HEAD\"}}",
   "name": {
-    "en_US": "Detach yo' HEAD"
+    "en_US": "Detach yo' HEAD",
+    "zh_CN": "分离HEAD"
   },
   "hint": {
-    "en_US": "Use the label (hash) on the commit for help!"
+    "en_US": "Use the label (hash) on the commit for help!",
+    "zh_CN": "使用提交记录上的标签(hash)来求助！"
   },
   "startDialog": {
     "en_US": {
@@ -86,6 +88,84 @@ exports.level = {
           }
         }
       ]
+    },
+    "zh_CN": {
+      "childViews": [
+        {
+          "type": "ModalAlert",
+          "options": {
+            "markdowns": [
+              "## 在Git中前后移动",
+              "",
+              "在接触Git的更多高级主题之前，我们先学习用不同的方法在代表你的项目的提交记录树上前后移动。",
+              "",
+              "一旦能够熟练地在Git中前进后退，你使用其他git命令的威力也会被放大！",
+              "",
+              "",
+              "",
+              "",
+              ""
+            ]
+          }
+        },
+        {
+          "type": "ModalAlert",
+          "options": {
+            "markdowns": [
+              "## HEAD",
+              "",
+              "我们首先看一下\"HEAD\". HEAD是当前提交记录的符号名称 -- 其实就是你正在其基础进行工作的提交记录。",
+              "",
+              "HEAD总是指向最近一次提交记录，表现为当前工作树。大多数修改工作树的git命令都开始于改变HEAD指向。",
+              "",
+              "HEAD通常指向分支名（比如bugFix）。你提交时，改变了bugFix的状态，这一变化通过HEAD变得可见。"
+            ]
+          }
+        },
+        {
+          "type": "GitDemonstrationView",
+          "options": {
+            "beforeMarkdowns": [
+              "在实例中看一下。我们将会观察提交前后HEAD的位置。"
+            ],
+            "afterMarkdowns": [
+              "看! HEAD一直藏在`master`分支后面。"
+            ],
+            "command": "git checkout C1; git checkout master; git commit; git checkout C2",
+            "beforeCommand": ""
+          }
+        },
+        {
+          "type": "GitDemonstrationView",
+          "options": {
+            "beforeMarkdowns": [
+              "### 分离 HEAD",
+              "",
+              "分离HEAD就是让其指向一个提交记录而不是分支名。这是命令执行之前的样子： ",
+              "",
+              "HEAD -> master -> C1",
+              ""
+            ],
+            "afterMarkdowns": [
+              "现在变成了",
+              "",
+              "HEAD -> C1"
+            ],
+            "command": "git checkout C1",
+            "beforeCommand": ""
+          }
+        },
+        {
+          "type": "ModalAlert",
+          "options": {
+            "markdowns": [
+              "想完成此关，从`bugFix`分离出HEAD并让其指向一个提交记录。",
+              "",
+              "通过hash值指定提交记录。每个提交记录的hash值显示在代表提交记录的圆圈中。"
+            ]
+          }
+        }
+      ]
     }
   }
-};
+};