Refactor of Language functions out of lowlevel/FileTools.cpp and into a new class lowlevel/Language.cpp
Using new Language.cpp location for language-related functions.
Merge branch 'master' of git://github.com/christopho/solarus
Merge remote-tracking branch 'solarus/master'
Removing using std::string lines.

Doesn't seem to fit the style of the rest of the codebase.
Merge pull request #373 from joshuarobinson/master

Refactor Language methods from FileTools. to new Language.h