HackStudio: Add statusbar with file and selected text information

Author: https://github.com/ry-sev
Commit: 2634cab7a8
Pull-request: https://github.com/SerenityOS/serenity/pull/8380
Reviewed-by: https://github.com/aatosmajava

Userland/DevTools/HackStudio/Language.h

@@ -20,5 +20,6 @@ enum class Language {
 
 Language language_from_file_extension(const String&);
 Language language_from_name(const String&);
+String language_name_from_file_extension(const String&);
 
 }