Added "system locale" in the language list.

On non-english systems, the empty string (default value) won't select english but
the system locale. So we need different options for those two possible values.

git-svn-id: svn+ssh://svn.code.sf.net/p/yabause/code/trunk@3203 d7be59e3-070e-4b9a-85a1-4646befae34d
Fixed a few warnings.

git-svn-id: svn+ssh://svn.code.sf.net/p/yabause/code/trunk@3204 d7be59e3-070e-4b9a-85a1-4646befae34d