[RCD] Hellenic (Greek) Translation

[Jim Deves]

Hello all and happy holidays. I'm sending the updated Greek - Hellenic 
translation for rc2. Also I noticed what might be a grammar error in the 
English version of messages.inc for message "receiptsent". I believe it 
should read "Successfully sent the receipt message", past tense, instead 
of "Successfully send the receipt message".
Might be easier to update it directly instead of submitting a new archive.
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