When you download a popular theme or plugin, you may notice that in some cases, it’s available in more than one language: Let’s get right to it! An Introduction to WordPress Language Files
Then, we’ll show you how to edit them manually, as well as alternative approaches to localization. In this article, we’ll go over the types of language files that WordPress uses. This ensures that any text they provide for your site is available in all the languages you require. It’s also crucial if you intend to translate the plugins and themes you use as well. Understanding how WordPress localization works and which files are involved in the process can come in handy when adding new languages to your site. However, regardless of which approach you choose, it pays to understand how to edit WordPress language files manually.
You can do it manually, use a plugin or machine translation, or even hire a professional to do it for you. There are a lot of ways to translate a WordPress website.