Correct code comments

app/test/helper.py

@@ -21,7 +21,7 @@ def signup(URL, driver):
     elem = driver.find_element_by_id('password2')
     elem.send_keys(password)    
     
-    elem = driver.find_element_by_class_name('btn') # 找到"登录"按钮
+    elem = driver.find_element_by_class_name('btn') # 找到"注册"按钮
     elem.click()
 
     try:

app/test/test_add_word.py

@@ -15,7 +15,7 @@ def test_add_word(URL, driver):
         elem = driver.find_element_by_xpath('//form[1]//button[1]') # 找到"把生词加入我的生词库"按钮
         elem.click()
 
-        elem = driver.find_element_by_name('add-btn') # 找到加入我的生词簿按钮
+        elem = driver.find_element_by_name('add-btn') # 找到"加入我的生词簿"按钮
         elem.click()
 
         elems = driver.find_elements_by_xpath("//p[@class='new-word']/a")