Currently, official WordPress plugin repository (this site) allows one language. Most developer uses English to write documents. But, non-natives of English are hard to read many English documents.
I suggest that the repository recognize and show READMEs of another language if filename of the documents are like below:
* README.txt for English
* README.ja.txt for Japanese
* README.zh-CN.txt for Simplified Chinese
* README.fr.txt for French.
Most web browsers has an ability to send the acceptable language.
Most webserver can understand the browser's language selection, and send a document of desirable language.
I think this repository should use this feature of browsers and servers.
Also, theme directory has the same situation.
