A better language library

[eluser]Negligence[/eluser]
If you've ever had to develop multi-lingual applications before, and perform translations, you would come to appreciate having english, french, etc., language strings in a single file, instead of finding/replacing in two different files in two different directories.

Second, the current Language library requires that you retrieve individual language strings individually. What happens when you've got fifty different strings you need to retrieve? This new library replaces fifty calls to line(), with one call to getKeys().

As a side note, although its not included in the library, I set the language in the session. I just didn't include that in the setLanguage() function.