Strip system-ui from --bs-font-sans-serif, sysem-ui have many i18n problems

[tats-u]

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

system-ui introduced by #25604 & #30561 brings various i18n problems in non-Latin environments. Don't use it in web sites other than WebView-based desktop apps or OS widgets.

Correct (Segoe UI + sans-serif):

↑In 🇨🇳 (Simplified Chinese), "！︁" must be rendered as the form "！︀". In 🇹🇼 and 🇭🇰 (Traditional Chinese), "。︀" must be rendered as the form "。︁".

Incorrect (system-ui → Yu Gothic UI in Japanese Windows):

↑

• Bold Ω is shown as the Cyrillic и in Yu Gothic UI due to an error in its glyph.
• Chinese characters that should be drawn differently in different regions are erroneously rendered using a single Japanese font. https://heistak.github.io/your-code-displays-japanese-wrong/

↑ Some characters are excessively crowded together (by design) and difficult to read.

Although now fixed, Yu Gothic UI had another bug until about six months ago where it unintentionally overlapped consecutive ideographic brackets (「」), leading to nonsensical displays on pages using Tailwind (while the latest version has dropped it, it had relied on system-ui for a long time until recently), such as ChatGPT. This forced Chromium to implement a specific fix to mitigate this bug for Yu Gothic.

w3c/csswg-drafts#11074
https://issues.chromium.org/issues/331123676?pli=1

This was very ugly and annoying.

It is a huge mistake to assume that system-ui will resolve to the most neutral, versatile, and readable font within the OS (e.g., San Fransisco, Segoe UI) on every device.

-apple-system + BlinkMacSystemFont don't interfere with non-Apple OSes and the are the most recommended if you just want to use the most beautiful Latin fonts at least in Apple devices.

• [css-fonts] system-ui behavior is undesired for some users w3c/csswg-drafts#3658
• Japanese font is not suitable for documentation sites in Japanese Windows, Japanese/Chinese fonts are not used in Japanese/Chinese pages in Chinese/Japanese Windows, and Segoe is not used in English pages in CJK Windows due to system-ui withastro/starlight#3721
• Prefer sans-serif to system-ui in default fonts vuejs/vitepress#4946
• Don't use system-ui, strip it from --ifm-font-family-base facebook/docusaurus#11727
• Greek letter "Ω" is displayed as Cyrillic letter "и" when bolded in Japanese Windows tailwindlabs/tailwindcss#19767
• Japanese/Chinese fonts are not used in Japanese/Chinese pages in Chinese/Japanese Windows by default tailwindlabs/tailwindcss#19768

system-ui interferes with non-Apple OSes. -apple-system and BlinkMacSystemFont don't.

#22328 & #22377 is preferred.

Reduced test cases

1. Set Windows system language to Japanese
2. https://codepen.io/tats-u/pen/NPdzpYg

What operating system(s) are you seeing the problem on?

Windows

What browser(s) are you seeing the problem on?

No response

What version of Bootstrap are you using?

v5