This is an experimental fix for spellchecker. Previously, we were only using this on macOS since on other platforms, the spellcheck-module claimed to auto-detect + switch language on the fly but looks like it's not working as expected.
Ideally spellchecker should detect the language, but on macOS, it fails to auto-detect the lanugage user is typing in
that's why we need to mention it explicitly. We set this language with the help of the default language of the server.