As we all know, almost all of the plugins on the market have an English interface. However, there are non-English speaking countries, and many people who live in those countries need to translate their plugins to their local languages. Luckily, the FS Poster plugin allows you to translate it to any language.
There are many ways to translate a plugin into a language you prefer. You can find many fast and comfortable 3rd party plugins that are useful for translating plugins. The most common plugins are Loco Translate and WPML. These two plugins also give very good results indeed.
Here is a step by step documentation to translate FS Poster.