I changed Locale.en-US.Date.js to meet the greek language standards
@perarg thank you!
I will close this PR because I included your contribute in a new one with the correct file.
@perarg could you please translate also the Form validator file? That would be great: https://github.com/perarg/mootools-more/blob/master/Source/Locale/Locale.en-US.Form.Validator.js