Hey there, Your_average_minecrafter!
This tool is specifically for reviewing translations of the Wurst Client, including the descriptions of its various modules, their settings, the syntax and error messages of .commands, and other in-game text. I apologize if that wasn't clear.
I've needed a tool like this for a while, since it's too much text to review by just looking at the raw JSON data, and becasue existing tools like Crowdin didn't really adapt to my workflow.
However, I'm not sure what you mean by "the whole English dictionary for chat". I think it might not be obvious at first how much in-game text the Wurst Client actually contains, but looking at the sample analysis linked above should give you an idea of how much work goes into these translations.
(And keep in mind that this is with most of the in-game text not yet supporting translation. The langfiles will be several times bigger once all of the settings and commands are translatable. I'm honestly not sure if this tool will be enough to keep up with that.)