fix: make spans inline

[BlueGlassBlock]

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[WRXinYue]

I believe this PR is correct, but there are some details that need to be emphasized.

For example, according to the W3C HTML5 specification and Chrome default styles, the default value of the display property for certain HTML tags, such as span, is not explicitly listed. According to the CSS Display specification, the initial value of display is inline. Therefore, here is a more intuitive list of default display property values for HTML tags:

display	HTML Tags
block	div, p, h1, h2, h3, h4, h5, h6, ul, ol, form, option, main, header, footer, section, nav, article, aside, body, html
inline	a, span, img, iframe, video, label, br
inline-block	input, textarea, select
list-item	li
table	table
table-row-group	tbody
table-row	tr
table-cell	td, th
none	head, style, script, meta, title, link

Regarding browser style resets: currently, the only pure CSS method is to manually look up and set the browser's default values.

@YunYouJun Do we need to further expand on other HTML tag css-i18n?

[github-actions]

[YunYouJun]

We can expand it when we need it.