Internationalisation support

Started splitting all text strings into data files. This will allow localisation into languages other than English. 

These data files are stored in the new lang\ directory, named with the .ps1 name (e.g. vCheck.psd1). To add support for other locales, a new folder containing files needs to be created (e.g. "de-DE" for our German friends). The keys need to stay the same, but values are to be tailored to the new language. 

As it stands, only the core component of vCheck has been modified and the connection plugin. Other plugins should be updated as well, but will still function without. If we have anyone keen to get translating that would be great too.