Remove unnecessary backup translations.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 592addeadd)

translations/messages/zh_CN.po

@@ -1558,36 +1558,6 @@ msgstr ""
 "息...</b>\"项来再次显示它。</font>\n"
 "</p>"
 
-#~ msgid "Alt+M"
-#~ msgstr "Alt+M"
-
-#~ msgid "Alt+S"
-#~ msgstr "Alt+S"
-
-#~ msgid "Alt+C"
-#~ msgstr "Alt+C"
-
-#~ msgid "Alt+U"
-#~ msgstr "Alt+U"
-
-#~ msgid "Alt+A"
-#~ msgstr "Alt+A"
-
-#~ msgid "Alt+R"
-#~ msgstr "Alt+R"
-
-#~ msgid "Alt+X"
-#~ msgstr "Alt+X"
-
-#~ msgid "Alt+B"
-#~ msgstr "Alt+B"
-
-#~ msgid "Alt+O"
-#~ msgstr "Alt+O"
-
-#~ msgid "Alt+Y"
-#~ msgstr "Alt+Y"
-
 #~ msgid "File"
 #~ msgstr "文件"