i18n: translate the new link messages into Simplified Chinese

The FreeBSD job failed complete_languages_translate_every_message: zh-hans was
missing the four Links and Attributes messages this branch adds.

The merge created a state neither side had. This branch predates main adding
zh-hans to COMPLETE_MESSAGES, so its new messages had no Simplified Chinese; the
other 17 languages conflicted and were resolved as a union, while zh-hans merged
cleanly and silently without them. da, id, nl and zh-hant are also missing them
but are not on the completeness list, so they are left as they are.

Terminology follows the file's own: 编辑原稿 for Edit Original, 浏览器 for
browser, 不是文件 after {path} 不是文件夹. These want a native speaker's eye
before release; the test only proves the strings exist.

crates/ui-egui/src/i18n/zh-hans.tsv

@@ -4996,3 +4996,8 @@ lighting	Light	光源
 @msg	too many library panels were opened in this session	本次会话中打开的库面板过多
 @msg	The image is {_1} × {_2} pixels, more than {LARGE_TRACE_SIDE} on a side: it is traced, but more slowly. A lower-fidelity preset or a smaller copy of the image traces faster.	图像为 {_1} × {_2} 像素，某一边超过 {LARGE_TRACE_SIDE}：会进行描摹，但速度较慢。使用保真度较低的预设或图像的较小副本会更快。
 @msg	The image was traced at {_1} × {_2} pixels, scaled down from {_3} × {_4} ({_5} megapixels at most).	图像已按 {_1} × {_2} 像素描摹，由 {_3} × {_4} 缩小而来（最多 {_5} 百万像素）。
+# Links and Attributes: files and URLs handed to other apps.
+@msg	Edit Original opens image and document files only; “{name}” is not one	编辑原稿只能打开图像和文档文件；“{name}” 不是其中之一
+@msg	only http, https and mailto URLs open in the browser, not “{url}”	浏览器中只会打开 http、https 和 mailto 的 URL，不会打开 “{url}”
+@msg	{id} opens another app: only the person at the keyboard can run it	{id} 会打开其他应用程序：只有使用键盘的人才能运行它
+@msg	“{name}” is not a file	“{name}” 不是文件