Use Chinese UI language.

app/templates/login.html

@@ -122,15 +122,15 @@ h1{
 
 <form action="/login" method="POST">
     
-    <input type="text" placeholder="Username" class="username" name="username" required>
+    <input type="text" placeholder="用户名" class="username" name="username" required>
 
-    <input type="password" placeholder="Password" class="password"  name="password" required>
+    <input type="password" placeholder="密码" class="password"  name="password" required>
 
-    <button type="submit" class="btn">Sign In</button>
+    <button type="submit" class="btn">登录</button>
 
 </form>
 
- <a href="/signup" class="signup"> Sign Up</a>
+ <a href="/signup" class="signup">注册</a>
 {% endif %}
 {% endblock %}
 

app/templates/signup.html

@@ -123,13 +123,13 @@ h1{
   </section>
 
 <form action="/signup" method="POST">
-  <p><input type="username" name="username" placeholder="Enter Username" required="required" class="username"></p>
+  <p><input type="username" name="username" placeholder="输入用户名" required="required" class="username"></p>
 
-  <p><input type="password" name="password" placeholder="Password" class="password"></p>
+  <p><input type="password" name="password" placeholder="输入密码" class="password"></p>
 
-  <p><input type="password" name="password2" placeholder="Confirm Password" class="password"></p>
+  <p><input type="password" name="password2" placeholder="确认密码" class="password"></p>
 
-  <button type="submit" class="btn">Sign Up</button>
+  <button type="submit" class="btn">注册</button>
 
 </form>