[ + ] Added 2 new placeholders:

%myredeemplus_redeemed_<code>% - Shows how many times a given code has been redeemed

%myredeemplus_available_uses_<code>% - Shows how many uses of a code remain

[ / ] Fixed a bug that did not allow -1 to be used when expiring codes.

[ / ] Fixed a bug that allowed codes to be created even if the expiration was invalid.

[ !!! ] Reset lang files.