zh-CN: Proofreading and update plan for the JavaScript String section

[JasonLamv-t]

I plan to proofread and update the translation of the Javascript.String section. Anyone is welcome to contribute. If you find any issues with the Simplified Chinese String section or have already submitted a PR, please mention me so that I can add your work to the progress list below:

• overview, in [zh-cn]: Update translation of String overview #14019.
• constructor, in [zh-cn]: Update translation of String constructor #14040.
• @@iterator, in [zh-cn]: Update translation of String.@@iterator() #14045.
• anchor, in [zh-cn]: Update translation of String.anchor() #15273.
• at, in [zh-cn]: Update translation of String.at() #14051.
• big, in [zh-cn]: Update translation of String.big() #15274.
• blink, in [zh-cn]: Update translation of String.blink() #15303.
• bold, in [zh-cn]: Update translation of String.bold() #15304.
• charat, in [zh-cn]: Update translation of String.charAt() #14053.
• charcodeat, in [zh-cn]: Update translation of String.chatCodeAt() #14073.
• codepointat, in [zh-cn]: Update translation of String.codePointAt() #15046.
• concat, in [zh-cn]: Update translation of String.concat() #14111.
• endswith, in [zh-cn]: Update translation of String.endsWith() #14113.
• fixed, in [zh-cn]: Update translation of String.fixed() #15316.
• fontcolor, in [zh-cn]: Update translation of String.fontColor() #15317.
• fontsize, in [zh-cn]: Update translation of String.fontSize() #15318.
• fromcharcode, in [zh-cn]: Update translation of String.fromCharCode() #15047.
• fromcodepoint, in [zh-cn]: Update translation of String.fromCodePoint() #15089.
• includes, in [zh-cn]: Update translation of String.includes() #14142.
• indexof, in [zh-cn]: Update translation of String.indexOf() #14155.
• iswellformed, in [zh-cn]: Update translation of String.*WellFormed() #15173.
• italics, in [zh-cn]: Update translation of String.italics() #15333.
• lastindexof, in [zh-cn]: Update translation of String.lastIndexOf() #14184.
• length, in [zh-cn]: Update translation of String.length #14041.
• link, in [zh-cn]: Update translation of String.link() #15334.
• localecompare, in [zh-cn]: Update translation of String.localeCompare() #14351.
• match, in [zh-cn]: Update translation of String.match() #14425.
• matchall, in [zh-cn]: Update translation of String.matchAll() #14468.
• normalize, in [zh-cn]: Update translation of String.normalize() #15208.
• padend, in [zh-cn]: Update translation of String.padEnd() #14633.
• padstart, in [zh-cn]: Update translation of String.padStart() #14634.
• raw, in [zh-cn]: Update translation of String.raw() #14779.
• repeat, in [zh-cn]: Update translation of String.repeat() #14780.
• replace, in [zh-cn]: Update translation of String.replace() #14858.
• replaceall, in [zh-cn]: Update translation of String.replaceAll() #14902.
• search, in [zh-cn]: Update translation of String.search() #14964.
• slice, in [zh-cn]: Update translation of String.slice() #15000.
• small, in [zh-cn]: Update translation of String.small() #15375.
• split, already sync with upstream.
• startswith, in [zh-cn]: Update translation of String.startsWith() #15020.
• strike, in [zh-cn]: Update translation of String.strike() and align method docs #15380.
• sub, in docs: update sub() and sup() #15252, thanks @YangFong
• substr, in [zh-cn]: Update translation of String.prototype.substr() #15284, thanks @YangFong
• substring, in [zh-cn]: Update translation of String.subString() #15091.
• sup, in docs: update sub() and sup() #15252, thanks @YangFong
• tolocalelowercase, in [zh-cn]: Update translation of String.CaseConvert() #15117.
• tolocaleuppercase, in [zh-cn]: Update translation of String.CaseConvert() #15117.
• tolowercase, in [zh-cn]: Update translation of String.CaseConvert() #15117.
• tostring, in [zh-cn]: Update translation of String.toString() #15171.
• touppercase, in [zh-cn]: Update translation of String.CaseConvert() #15117.
• towellformed, in [zh-cn]: Update translation of String.*WellFormed() #15173.
• trim, in [zh-cn]: Update translation of String.trim* #15119.
• trimend, in [zh-cn]: Update translation of String.trim* #15119.
• trimstart, in [zh-cn]: Update translation of String.trim* #15119.
• valueof, in docs: translate full content of String.prototype.valueOf() #15251, thanks @YangFong

[yarusome]

备注：mdn/content#26847 中的某些任务可能会进一步改动英文版内容。

[yin1999]

Thanks a lot @JasonLamv-t. I'm going to close this as all the docs have been updated :)