Translate /c-api/dict.rst:48 (#968)

* Translate /c-api/dict.rst:48

* Apply suggestions from code review

Co-authored-by: Wei-Hsiang (Matt) Wang <mattwang44@gmail.com>

---------

Co-authored-by: Wei-Hsiang (Matt) Wang <mattwang44@gmail.com>

Author: SamLiaoP

c-api/dict.po

@@ -66,7 +66,7 @@ msgstr ""
 
 #: ../../c-api/dict.rst:48
 msgid "Empty an existing dictionary of all key-value pairs."
-msgstr ""
+msgstr "清空現有字典中的所有鍵值對。"
 
 #: ../../c-api/dict.rst:53
 msgid ""