Fix <code> bug for Edge translator

Replace <code> tags with styled <span> to fix the bug of Edge's translator.

Fix a long-standing bug in Microsoft Edge's built-in translator: it moves all <code> tags to the end of the paragraph when translating, resulting in a completely unreadable text paragraph.
- More detailed discussion: The translator always move the code tag content to the end - Microsoft Community Hub
Principle: replace <code> with the same-styled <span> on all pages
GitHub: https://github.com/yqs112358/EdgeTranslator-CodeTag-BugFix