Add more thorough check to language configuration in 'check' command
Add warning about using the correct language codes
fixing punctuation in the README's intro
Merge pull request #2269 from mikedory/develop

fixing punctuation in the README's intro
Add language code example to check function to clarify possible language/locale confusion
Fix whitespace issue
Merge pull request #2263 from yakky/feature/docs_langs

Checks against common error in language settings