Remove commented-out translations and clean up zh.po file.

Author: Binlogo

po/zh.po

@@ -17624,22 +17624,3 @@ msgstr ""
 msgid ""
 "[The rustdoc Book](https://doc.rust-lang.org/rustdoc/what-is-rustdoc.html)"
 msgstr "[rustdoc 手册](https://doc.rust-lang.org/rustdoc/what-is-rustdoc.html)"
-
-#~ msgid ""
-#~ "// Could `match` 1 ..= 12 directly but then what age\n"
-#~ "        // would the child be? Instead, bind to `n` for the\n"
-#~ "        // sequence of 1 ..= 12. Now the age can be reported.\n"
-#~ msgstr ""
-#~ "// 可以直接匹配 1 ..= 12，但那样无法知道具体年龄\n"
-#~ "        // 相反，我们将 1 ..= 12 的序列绑定到 `n`\n"
-#~ "        // 现在就可以报告具体年龄了\n"
-
-#~ msgid ""
-#~ "// Got `Some` variant, match if its value, bound to `n`,\n"
-#~ "        // is equal to 42.\n"
-#~ msgstr "// 获得 `Some` 变体，检查其值（绑定到 `n`）是否等于 42\n"
-
-#~ msgid ""
-#~ "The compiler forbids use of uninitialized variables, as this would lead "
-#~ "to undefined behavior."
-#~ msgstr "编译器禁止使用未初始化的变量，因为这会导致未定义行为。"