Pontoon/Firefox Profiler: Update Chinese (China) (zh-CN)

Co-authored-by: wxie <xiewensheng@hotmail.com> (zh-CN)

Author: mozilla-pontoon

locales/zh-CN/app.ftl

@@ -1105,6 +1105,11 @@ AssemblyView--prev-button =
 # The "▶" button above the assembly view.
 AssemblyView--next-button =
     .title = 下一个
+# The label showing the current position and total count above the assembly view.
+# Variables:
+#   $current (Number) - The current position (1-indexed).
+#   $total (Number) - The total count.
+AssemblyView--position-label = { $current } / { $total }
 
 ## UploadedRecordingsHome
 ## This is the page that displays all the profiles that user has uploaded.